The particular model Apple is selling is a 17” iMac 1.83GHz Intel Core 2 Duo, and you can purchase it for $999 USD or $1,099 CAD. There are no images on the website and the description is long gone. However, you can still place the order and checkout with it. In fact, @DetroitBorg on Twitter saw the original tweet from @DylanMcD8 and has ordered one already to see if Apple will still send this out!
This iMac launched in late 2006 and features three USB 2.0 ports, two FireWire ports, built-in AirPort Extreme and Gigabit Ethernet. Internally, the computer came with a 1.83 GHz Intel “Core 2 Duo” processor, 512MB of Memory (RAM), a 160GB internal 7200RPM hard drive, a slot-loading DVD-ROM/CD-RW drive, 64MB of DDR2 SDRAM, a built in iSight camera and built-in speakers underneath the computer.
This iMac (at the time) was a notably slower compared to the other Core 2 Duo iMacs available at the time due to the computer using a cheaper and slower Intel GMA 950 integrated graphics card.
You can view the iMac on both the US and Canadian Apple Store. I checked the UK Apple Store, and it is not available and the link does not work. For the moment, it appears that the iMac’s store page is only available in the US and Canada.
Credit to @DylanMcD8 for discovering this!