I have 3 of the older Legacy style P228/P229 9mm 13 round mags for sale. standard wear marks, but all function perfectly.

these are the pre-ban older Dovetail mags that are Pre Mec Gar (stamped J.P Sauer and Sohn)

$25 each

I also have 6 of the regular OEM Sig P228/P229 legacy mags as well. $25 each. 

these mags regularly go for $45 online new, and the JP Sauer and Sohn mags are fun finds that don't come up that often