Whether I would do it or not, I do not know, but if someone was like that with me, I would greet the boast with concern and say 'that much! I am sure you could have got it cheaper elsewhere. Did you look on ebay.
I just wonder if you treated her boasting as a sign of her being foolish for paying far too much for everything that she could buy cheaper elsewhere,she might stop doing it (to you at least)
AIBU To Be So Annoyed at the Stupidity of This
Father's Day Sunday — nobody makes cards for this type of dad
Granddaughter delaying period, advice please
she is actually really lovely