At Midway and Brownells the price is 242 +freight
At Amazon it is 206.49 + free shipping
Is it the same stock? Why almost $40 less?
Maybe, maybe not but a quick look at their Amazon Store Profile
would make me wary of buying Magpul products from them:
"Big T Products is one of the top online retailers for your Gun and
Airsoft needs! Hunting equipment, gun parts, optics and many other
accessories along with all the airsoft and air guns, ammo and
accessories you'll ever need are carried by BigTProducts!"
In other words, that might be a fake item and it might not be. Personally, I'd rather buy it from a dealer I know I can trust and there's at least one vendor that's a site sponsor with a better price. You just need to dig a little:
Hamlund Tactical $194.99
I bought a pair of ACS stocks from them and the transaction was flawless.
FWIW, Midway and Brownell's typically have higher prices than most.
HamLund Tactical has the Magpul PRS for $185 shipped.