I have booked myself in to get my make up done at a counter in a department store for an occasion. The deal is you pay £30 but you then can redeem the £30 on products. Aibu to just spend the £30 on what I need or will I be expected to spend more? I don't mind for instance spending a few pound more for example a foundation comes in at £35. Just don't want to have to pay excessive amounts for stuff I may not use again. Thanks