For OEM inks
www.atlex.com has very competitive price as long as you buy enough to cover their shipping costs. I believe the Canon 9900 inks are about 9.50 per cartridge. Their prices on Canon papers are also very good. Don't know if this is the cheapest for OEM, but they are reputable and from Fl to NH takes about 4 days max for order to come in. Hope this helps.