I second Point Blank on ClipsNStuff. Very good to do business with. I have purchased several magazines from them and will continue to do so in the future. They are absolutely honest and accurate in their representations of used magazines. You get what you pay for with no surprises.
Take Care
All of the mags that I have for my P95 are 15rd, except for the two 20rd'ers. I dumped the two Klinton mags that came with it when I traded off my P89. I am not sure where you can get them any more. I bought most of mine from CDNN, with a few bought locally here in the Phoenix AZ area. BTW I have 10 of them.
CDNN investments carries both ProMag aftermarket and Ruger 15 rounds mags. I bought a couple of the factory 15 rounders--used-- for $30 if I recollect correctly. They work fine. The proMags work OK to; stay away from the Pachymeyer 10 rounders--real junk.