I know of ex grip extensions for around 15 or 16 dollars or so, but does Smith and Wesson offer OEM extensions that are a little cheaper?  Also, there are ones called Amerigun on ebay and stuff that are pretty cheap but don't seem like the best quality.  Any alternatives on products I'm missing out on?

I was going to get the ACT 17 rounders from Lanbo's Armory that are around 15 dollars and use extensions.

Thanks.

the best price on the X-grip adapters was at Lanbos.

@ks_wayward_son If you want some of these factory ones I'll throw a couple on the mail for $10 to cover the postage.

I didn't even think to check in my old M&P box...lo and behold there are 2 there ready for use.  DOHHHH!  Thank you though, Brazos.  If I would like to get a few more I will definitely keep your offer in mind.  I appreciate it!