We have a £20 rule for buying gifts in the family.
SIL loves a bargain and admittedly has a great eye for bargains, so you always get something designer/ branded which she says she got reduced with codes/ in a sale. For my birthday she got me a mini make up set which is valued as £50.
It's not that I don't appreciate it, but I feel so pressured to reciprocate with an equally valuable present..... is that a bit ungrateful?