If you're going to buy a printer be very careful. Laserjets actually bake the 'ink' into the page, rather than just spraying it over the top like a desk-jet or ink-jet printer will if you're buying the ordinary retail versions.
Neither are waterproof since paper isn't by default waterproof, but the laser-jet ones, especially mono-lasers, that print only in black won't fade out for a very long time.
Deskjets spray the ink onto the page, they aren't waterproof generally, and will smear if you either touch the page before the ink is dry, or get it wet. It'll run like masqara.
My best suggestion if you want to print and waterproof a sketch or printed piece of coloured art from the PC (such as digitally coloured) than print it out on either a mono-laser jet, colour laserjet, or inkjet printer, wait for it to cool, and then get the thing laminated. The paper will be 'sealed' in a plastic sleeve and it'll essentially be waterproof since the sides of that laminated plastic cover are heat sealed on all sides.
Plastic sleeves can be cheap to expensive dependent on size, laminator's too provided that you can find one for an inexpensive retail price.
Inkjet printers are relatively cheap, but avoid HP models, they're generally fraught with technical faults. It's more to do with the brand than the tech they make, or made, I did hear that HP was getting out of manufacturing PCs since they couldn't compete effectively with other similar brands. Not sure right now though.
If you want a printer/scanner, and you don't have an old scanner that still works, pick up a printer-scanner combo. I use a PIXMA 280 combined printer and scanner. I don't use the printer very much, since I only brought it for the scanner to scan piccies into. It's handy if you have a photo-editing program on hand on your PC too, especially if you want to resize, save in various formats, paint and whatnot digitally if you scan in an inked or pencil sketched piece.
I do both, although, if you want to 'scan into' the PC, you're best going for below 400 DPI, about 300 DPI will do, since anything above 500 DPI is going to have your image with a file size of a couple megabytes. It's really up to the artist.
Also if you buy a new printer be aware of the technical specifications in terms of what it needs to run on your PC. You'll need to check that your RAM memory size, hard drive, and operating system (XP, Linux, Windows 7, Vista etc) is supported by the printer, if it's not you won't be able to install it, or the drivers to run the thing.
Believe me I have plenty of experience in installing tech, hunting round for system drivers, and getting frustrated over a piece of computer glitchyness. It's a proverbial pain in the keister.
Secondly be mindful that although a deskjet printer is cheap the inks, especially black and coloured can be very expensive as a duo pack or individually. I'm talking between 40 to ninety dollars for one ink pack not both and that depends on the size of the ink catridges that a deskjet/inkjet printer will take. You can get refillable ones, usually EPSON I think but you must realize that you have to be able to purchase the ink refills. It's not good having refillable catridges if you can't buy the inks to refill them. Other deskjets like HP or Canon or various brands will sell unrefillable ink catridges either in dual packs with a coloured one and a black ink or as single ones.
They're not cheap and you will repay the cost of your deskjet/inkjet printer twice over with the first spare ink catridges that you buy. Secondly the catridges only usually hold between 9 to 25 ml of ink, either black or coloured, in an ordinary home-use, retail deskjet/inkjet printer.
It's not much and you'll likely get between 25 to 100 pages printed from the catridges black and coloured at most, especially if you print alot.
I only use my deskjet printer sparingly if I want to print out the coloured versions of any digitally coloured artwork. Otherwise I use a mono-laser that has a drum and toner catridge in black, to print anything else either text or plain uncoloured art. You'll get about 1000 to 2500 printed pages out of a laserjet Canon printer, dependent on the size of the toner catridge. The toners go for between 100 to 125 bucks a toner, but they'll last for three to six months dependent on the frequency of your printing, even up to a year if you don't print much.
A deskjet/inkjet catridge, dependent on how much you printer might last you a week to a month, maybe two if you stretch out the printing and only print what you need too.
Canon and laserjet printers, you will eventually need to replace the drum unit, they can last a toner catridge for around 15000 to 25000 printed pages. When that happens, just buy another mono-laser jet, it'll be cheaper than replacing the drum, and you'll get an updated printer, new drum, and catridge in one.
Be economical when you're looking to buy a printer, especially since you should really consider what you're budget is, and what you'll be using the printer for overall.
~ Pyre