[quote name='Roufuss']It's not the cashier, it's the computer... the computer will lock up and will override the price match to give you the coupon.
It's YMMV because sometimes a dumb cashier calls a manager who will manually override it.[/quote]
That's the real issue, yes.
Sometimes, CC will take competitors' coupons (none of mine out here do), so that might have been the only way you could pull that one off.
In any case, to the OP, if you tried to PM a game down below $19.99, the GGC wouldn't work anyway.
On a $30 game like Kameo, PM + 10% would have netted the game out at $18.99, which is a better price than the $19.99 @ CC.
PM + GGC or other coupon usage is YMMV for the reason Roufuss states above, the PM prevents any other adjustment save manual adjustment, and if the cashier isn't a
ing idiot, it won't work.