You can also use model 59 mags or Mec Gars when you find them. I remember a year ago when I was looking,there wasn't much out there unless you spend a lot for them and most of which you find, are used. You can try Ebay, as that is where I found mine for my 6906. Gunbroker has some. Look for seller Robertsontradingpost-S&W 6906 669 Extended 17 round Magazine Mec-Gar 469 6904 9mm $5 Ship-item number 1043298832. I have bought from them as well.