rebate shop
n.β Β«He bets through what are called rebate shops, which are off-shore, on Indian reservations or in states with fewer regulations. Rebate shops offer from 4 percent to 10 percent back on every dollar wageredβwin or lose.Β» ββHorse Racingβs Biggest Bettors Are Reaping Richest Rewards” by Joe Drape New York Times Apr. 26, 2004. (source: Double-Tongued Dictionary)