go for it - sell it - and as has been mentioned, say "thanks, but don't buy any more, we just don't use it/have space"

we have one tupperware item that rarely gets used - we got it in a mystery pack - everything else gets used all the time. the one item we don't use is sitting in the pantry waiting to go to my brothers house (cos i know they would use it) - apart from that, everything we have has been purchased because we needed it. but i will admit, we culled HEAPS to charity when we moved here about 18 months ago. so much clutter before that - inherited from mum/nan/DHs mum