Walmart offers the HP 61 Combo Inkjet Ink Cartridge, model no. D8J80AN, bundled with 10 5x7" Photo Cards, 10 Envelopes, five Sheets of 4x6" Photo Paper, and a Project Booklet for $19 with free shipping. That's tied with yesterday's mention (which required pickup) as the best price we've seen. (It's also a current low for just the ink cartridge by $12.)

Update: Opt for in-store pickup to avoid the $4.97 shipping charge.