The mods are evil robots all jacked up on jolt cola and nocotine gum. Beware their wrath!
On a more serious note, I'd try ebay or just buy a low-end current MB+CPU+Mem. For example, it would be silly to pay $90 for a 939 MB when you can buy a low-end intel or AMD setup for less than $100. The prices of 939 MB's are likely to be VERY high given their performance compared to modern cpu options. Prices on motherboards genrally plummet right after a platform phases out, but then start increasing as that platform ages into oblivion.