I don't know if I can do this legally or not....
I have a 5-user (which is the all-out maximum possible) Pervasive 10.0 / Summit Workgroup edition that I've decided not to use. 2000i C/S works fine on my SBS-R2 / XP-Pro setup. Note that if you have a machine that is only used as a server you will have effectively only 4 user licenses as the "server" takes one too.
List price is $250. I will sell it for $200 including shipping, still in the original shrink-wrapped package.
http://ww1.pervasive.com/ecommerce/Scripts/prodView.asp?idproduct=120