Did you go online? I got a fab swimsuit from M&S on sale for 16 euro. Its black and leopard print and has built in tummy panel and proper built in bra, its fab!
Ophelia had some panache on sale for 20 euro last week, they are quite good. You need to rummage in the sale rail but you can get lucky.
Tesco has some nice ones too with built in tummy panel and good cup support. I got a swimsuit with mini skirt attached for 8 euro in their sale – very comfy and looks lovely on. You need to rummage in there too but you can get lucky!
HTH – happy shopping 😀