I try to stay with the manufacturers magazines If possible. Others may have opinions on good aftermarket mags. I do know that I have had problems with some of the cheaper aftermarket magazines in my AK, and AR rifles.
I'm not sure on the Ruger P series, but the prices asked for the ones on the websites I shared don't seem to be too far out of line. Around thirty bucks is pretty common for magazines even before the buying panic.
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!