$200 IS the going rate for a pair marketed as "Onyx" percs. However, let me make myself clear.
Most LFS don't know the difference between onxy or regular percs and will usually sell them for $15-25 each. However, if they are marketed and sold as "Onxy" perculas, then the going rate for a 'pair' is anywhere from $100-250 (usually $199), depending on the source.
Good find at Jeff's.