I have an A7V133 rev 105 and heard that it's the latest one.
I bought it as a "refurb" from
newegg.com for $65 with free shipping. They seem to still have these or similar board in stock from time to time. Mine had the 1007 BIOS installed, you may possibly need BIOS 1007a for the xp.
This is a fine board. My guess is it's not really refurb but new without retail package, but that's just a guess.