Indeed, bingo supplies are needed to play bingo, and the first and the most important supply is the bingo cards. The bingo cards are printed in a mechanical fashion, and their bingo patterns are arranged randomly by a random number generator - a fairly balanced computer algorithm that makes random and non-repeating cards. The bingo cards, as well as any other bingo related stuff, is usually produced in bulk amounts and can be found at any gambling retailer or an online store that specializes in online bingo. Bingo cards are an inevitable cost in any bingo supply order.
The other thing that is always needed for a bingo game is of course dabbers - markers that are used to cross out or mark a bingo card. As you know, a bingo player who finishes first is considered the bingo winner, and thus having an appropriate tool is critical if you're serious about your bingo carreer. For various technical reasons and due to many diferent rules, it is preferred in many bingo halls to have strict resulations about what kind of tools and aids can be allowed to the players so that the game will remain fair and in hope that the plaers will even each other out.
The supplies for bingo and bingo hall, except for maybe sandwiches and hot drinks, can be easily obtained at any wholesale gambling equipment store or even smaller private stores that deal gambling items. Lately, internet seems to be the most efficient market for bingo and bingo related items.