Amazon.com offers the Apple iMac Core 2 Duo 3.06GHz 21.5" Desktop, model no. MB950LL/A, for $1,129.98. With free shipping, it's the lowest total price we could find by $39 and $69 below what Apple charges. The new iMac features an Intel Core 2 Duo 3.06GHz dual-core processor, 21.5" 1920x1080 widescreen LCD, 4GB RAM, 500GB Serial ATA hard drive, NVIDIA GeForce 9400M graphics, SuperDrive, Bluetooth 2.0+EDR, AirPort Extreme, iSight, Apple Magic Mouse, and Apple Aluminum Keyboard (small).
Update: MacMall has it for $1,144.99 before this $50 mail-in rebate, $1,094.99 after. With around $16 for shipping, that's $19 under the mention above and the lowest total price we've seen. Rebate ends November 30.