DALLAS -- The Army & Air Force Exchange Service invites shoppers to see what lurks on its shelves as it gives away $3,000 in Exchange gift cards.The "Be: Ware this Spooky Night!" contest will send Exchange patrons on a "spooktacular" hunt throughout the store. Contestants will have to locate five Halloween game signs wherever they find treats and sweets. Each sign will contain a word which will help finish a Halloween story. After collecting all five words, contestants can go to shopmyexchange.com/patriotfamily for full details and link to enter on the Exchange's Facebook page.Four randomly drawn winners will receive a $500 gift card with another ten runners-up taking home a $100 gift card."This sweepstakes will have you screaming for more," said Exchange Plans Officer Lt. Col. Tom Shrader. "In addition to the sweepstakes, the Exchange is stocked with all the Halloween essentials. From candy to costumes, we've got all the boys and ghouls covered."The contest ends at the stroke of midnight on Oct. 31 and no purchase is necessary to enter.