︎rebate shop
n.— «Rebate shops have no such overhead to cover and give most of it back to their customers. Typically, that amounts to between 3 and 12 per cent of the amounts bet, even as high as 18 per cent on some exotic bets.» —“Complex betting world” by Chris Young Toronto Star (Can.) Apr. 17, 2004. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...