>We don't know the exact circumstances, but it seems there *is* an agreement (at 1/2 price). As long as some sort of documentation can be shown to a judge it should be enforceable. This is small-claims stuff we're talking about - just getting legal papers started (or the threat thereof) ought to get things rolling.

Sometimes, paying a lawyer a 100$ to write a letter is all it takes. Make sure it is both special delivery and regular post.