I think it is part of the Universe’s perverse sense of humor.
I can not count the number of times I have thought “wow, I just bought this for 20% off” and walk a block down the street to see the same thing suddenly marked down 30%. Trust me, yours is not the only wall with ‘head thwacking’ marks on it!
Yeah, though I did do a search to see if there was anywhere else I could find it cheaper, and I didn’t find it cheaper. In fact I found one on eBay that they were asking somewhere around$100.00. So it may not be a bad investment, but it’s still a lot of money to spend. Hence the head thwacking.