Cheap and simple cash register software.

One of my customers would like to use a computer to accept payments, and update inventory for book sales.  Essentially a very basic POS system with no barcode scanner, no touchscreen (regular screen), and a normal laser printer as a printer. The sales volume is very slow, maybe 5 transactions a week, and the inventory is under 100 items.
I think a QB POS, or most commercial POS's are overkill for them, I have been looking at the open source stuff, and even that seems a bit too daunting for them (need an APache server, etc). Any cheap and easy recommendations? (they are currently using excel).
Oh, and they want something on-prem, no cloud solutions.
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