Your basic kit, consisting of mask, snorkel and fins, need not be expensive and there is a very wide price range. Once you progress to Open Water diving the equipment you require (dry suit, hood, gloves, BCD etc.) can cost quite a bit, but it should last you a long time, and you can also buy second-hand, perhaps from other club members or on eBay. Experienced club members are always happy to advise on what’s best for you and your budget, and often accompany new members to the dive shops when they are ready to buy.
The club also has some equipment that you may be able to try for your first open water experience, at the Diving Officer’s discretion.