i've bought 3 sets since i started with OS , and they have all been different money..have followed em when they have come up though, so i reckon if the drive arm and spider chromework is bang on, without bubbling/flaking etc, then i'd say about 250-275?
if they need work less obviously..had 2 sets redone and they are ok but not bang on..
200-225 for clean ones that arent perfect?
seem to be rare enough at mo so depends on who's looking...