RE: how much are dics worth
Two dics for $200 each isn't too bad actually, assuming they're full thickness and are the right size, you don't want to find out they don't fit when you try to mount them for the first time! You should have asked around here first, I reckon there's a few people who actually would have given you a dic for free, or maybe just for the cost of shipping, they're no good if you have no where to put them, a problem that many of our forum members currently have. Looking for replacements when you're really desperate isn't going to do you any favours in terms of price, either.
Are you changing because yours were undersize?
Justin.