Thrifting Electronics $40 into $800?

Well that box of calculators i got for $40 off of Facebook was far more lucrative than I thought.

Two models were actually one step up than what I had expected based on the Facebook photos.

I was only really after the hp 48g, it goes for $125 so just that alone would have been fine. It turned out to be the 48gx, a lot more desirable acceptable Condition was like$200. This had manuals and is in really good shape.

Prices for the 6 hp calculators listed on Amazon totaled about $750!?! Two other calculators are in the$15 each range on eBay (a Casio graphing calculator and a Sharp 2 line scientific)