Does anyone have any suggestions for stock control software ?

At the moment it comes in, they put a price tag on it, it goes in the shop, it sells and the staff write the item and price on a piece of paper. They tally up the suppliers invoices at the end of the month and compare them to what the staff have written down and hope it's all accounted for. They have eftpos at the till but just for payment.

One of their suppliers has suggested they use an excel spreadsheet they can supply using vlookups and a cheap barcode scanner, but I've seen better put together solutions by college kids to be honest.

Simplicity is the key here because they till staff are old and far from tech savvy.

Is there a solution which could work with the eftpos scanner/unit ?