If your wife was kind enough do surprise you with something she thought you'd like I would be inclined to just accept that it cost more than it should have - and not to have made a point of it with her.
She must feel really embarassed now that she tried to do something really nice for you and it's been turned into a 'value for money' issue - presents aren't really about that!
It was a present out of love - maybe more costly than it should have been, but if you don't want any more surprises any more then you may have taken the first step!!!