The printer works great with Windows, but it's been a couple of years that I've been using Linux/Mac and as there are no compatible drivers, I haven't used the printer in a long time.
http://www.amazon.com/Canon-imageCLASS-MF3240-Monochrome-Printer/dp/B000EILTCQ/ref=sr_1_2?s=electronics&ie=UTF8&qid=1387517469&sr=1-2&keywords=canon+mf3240
http://www.usa.canon.com/cusa/support/consumer/printers_multifunction/imageclass_series/imageclass_mf3240

Replacement cartridges can be found on amazon for <$20. For example:
http://www.amazon.com/Compatible-X25-Cartridge-Black-mf3240-mf5530/dp/B000V75NYK/ref=pd_sim_e_4