I went to a local thrift store, and got a couple of calculators for my
rapidly growing collection.

Casio FX-115

https://www.computerhistory.org/collections/catalog/102618806

A classic little scientific calculator, bright display, in great
shape with a little vinyl sleeve. $3.

Hewlett Packard HP-42S

https://en.wikipedia.org/wiki/HP-42S

The batteries were dead, but hadn't leaked. Shorted out the battery
leads while pressing the On button, replaced the batteries, and it
came up. It's in great shape, with vinyl sleeve, and I found a nice
third-party guide online. $3.

This one goes alongside my HP12C, HP10B, 20B and 20S. If I ever get an
HP16C or HP41CX, I'll stop.

Texas Instruments TI-83 Plus

https://i.pinimg.com/564x/3e/bf/76/3ebf760611e9abee76f1b12c5b1f6d29.jpg

$3. I keep buying these for cheap and giving them to kids I know in
high school/college. I should keep one for myself some time, but I
have no use for it.

Not that I have a need for 4 HP calculators, though...

:)


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