[USWestSCL] PDSC trade values?

Hi - I couldn't find this anywhere else in the trade guides, but what are the trade values (in runes preferably) of the different damage ranges of poison-damage small charms?

I've seen some people trading 300pdscs and others trading 100pdscs... but I recently found a 209 pdsc and have no idea what a fair price to ask would be.

Thanks!