The place is real.
The signs are not made up.
This store is called the Bonanza Gift Shop.
"Bonanza Gifts: World's Largest Gift Shop
2460 Las Vegas Blvd S, The Strip; 702/385-7359
Remember Vegas before the dawn of the megaresort and the city's ultimate return to cool? Like some classic road trip gift-shop memory, Bonanza carries classic kitsch and then some at its huge store on the corner of the Strip and Sahara Avenue. No trip to Vegas is complete without purchasing at least a few postcards, shot glasses, or Elvis sunglasses (with glued-on sideburns) from this unique store."