...at Osage guns. I ordered 2 and, even with shipping, they were less then $40 each, which is about $10 cheaper than any I have found locally. The link says "$37.99, but they are on sale.
Buy Sig Sauer P365 9mm 12-Round Magazine for $37.99 | MAG-365-9-12
does anyone have a source for cz ts/czechmate mags? I'm looking for 20 rounders for a tso I'm planning on buying in a few weeks. The cz shop page is down. The only other place I have found them is buds gun shop