This is an FYI post, so please take it for what its worth (or not). :-) I have nothing to gain from this financially, or otherwise.
I was intrigued with last week's thread "Is the HP33S the only game in town", in which the Casio FX-9860G Slim calculators came up again. Between the good endorsements (fast, nice display, etc..) and Hugh and Nigel's RPN implementations (Reckon, CasioRPN), I thought it was time to find one for myself for the RPN fun of it.
After seeing them go for around $100 at Amazon, Walmart, etc.. I end up at the the "auction sight". It turns out there is a guy in Indiana, a machinist by trade, that writes and sells Casio FX-7400G calcs with his own preloaded Machine Shop Calculations program(s). Apparently, he's tried out his programs on the hi-end FX-9860G and Slim models and for whatever reason, decided against going that direction.
So.. he has a couple Slim models available for $65 and an "upright" FX-9860G for $55. All are Buy-It-Now sales including shipping (inside the US). The downfall is none include manuals or USB cables, so it makes for a so-so deal overall.
I am expecting mine to arrive in a couple days, so I can't say yet if it is really in "like new" condition. But if you want to take a chance on a Slim model, look for "fx-9860", leaving off the "G" suffix.
<We now return you to your regular scheduled programs>.