Looks like a pretty decent deal; a boxed 3.0 is around $200 elsewhere, so basically a free ~$50 mobo. It doesn't say it's a Prescott on the page, but in the email I received the link was titled "Intel P4 3/800 E".
Link
Processor: Intel Pentium 4 3GHz (800FSB) Box CPU
3 Year Limited Manufacturer Warranty, CPU Fan Included
Chipset: VIA PT880
Processor Support: Intel Pentium 4 upto 3.6GHz ( 533/800 FSB) or higher
Memory Support: Up to 4GB of PC3200 DDR DRAM
Expansion Slot: 1x (8X) AGP, 5x PCI
Other Features: 6.Ch Audio, 10/100 LAN, Serial ATA RAID
Forgot to mention the email says the offer ends September 2.
Link
Processor: Intel Pentium 4 3GHz (800FSB) Box CPU
3 Year Limited Manufacturer Warranty, CPU Fan Included
Chipset: VIA PT880
Processor Support: Intel Pentium 4 upto 3.6GHz ( 533/800 FSB) or higher
Memory Support: Up to 4GB of PC3200 DDR DRAM
Expansion Slot: 1x (8X) AGP, 5x PCI
Other Features: 6.Ch Audio, 10/100 LAN, Serial ATA RAID
Forgot to mention the email says the offer ends September 2.