should be able to get them around 1,000. i can find you some links tonight when i get home from work.
heres a couple links nippon-motors is probably the best one i couldn't find many more sites, found some but they just listed sti stuff. http://www.tokyomotorimports.com/engine/84/STi%20EJ20t%20(Version%202).html http://www.nippon-motors.com/index.htm
just call, they have just individual motors too, at least nippon-motors does. they just list packages because that's what most people buy.
You can also check fineline imports. They sell EJ20G's for $2k for the full motor with IC, turbo manifolds etc. but have enough on hand to break some up, or might have some blocks lying around. I saw a perfectly good 20G block go on ebay about six months ago for $250. The prices have gone up a bit since then. Also, not all EJ20G's are fully closed, so you need to check on that too. The block that sold on ebay was not, but was stamped EJ20G from a leg turbo.