Robert Griffin III -- Fire Sale On Jerseys ... At D.C. Sports Stores

File Under: "You Know It's Over When ..."

Check out the sale rack at City Sports in Washington D.C. -- slashing prices on RG3 jerseys ... days after he was benched in favor of Kirk Cousins.

We're told the jerseys were originally on sale for $100 ... but after various markdowns, numerous sales associates tell us you can get yours for a cool $47.99 at any City Sports in the D.C. area.

And that's not all ... Capitol Hill Sporting Goods tells us they're also hacking prices on RG3 jerseys.

Question is ... have the low prices resulted in more sales?