You could try StubHub or ebay.
I had two at $230, but I just had to let them go. If it were last night I'd probably have pulled the trigger, but now that I'm calmer I realized that $500 for a game they a) aren't guaranteed to win and b) won't be clinching anyway is a little obscene.
I'll have to settle for a bootleg Versus feed, or maybe go see the local ECHL team in their championship game 1 for $10.