Inventory tracking in a small retail location

Hello,

I'm looking for solutions to help track inventory in a certain small retail store. The store currently uses "manual entry" registers (i.e., the clerk enters the price and category of the item from memory). We'd like to find a good solution to track inventory, using barcodes, on a daily basis.

Ideally, I'm looking for a handheld device that scans barcodes and allows a person to enter the quantity on hand, etc. It should be able to store the prices of about 50 items, and be able to calculate the daily sales based on change in inventory. I would prefer a non-computer based application, that is, something handheld that will just give the sales figures on the screen.

If it helps, here's an explanation of the specific application that I'm looking into using such a system for:
A retail location that sells state instant lottery tickets, which (in the past) has had employee theft problems. We calculate (manually) the dollar amount of how many tickets were sold by observing the change in inventory, and then compare these figures with the amount that the clerks "ring up" on the registers. This sort of tracking is really only needed for this one purpose.

Thanks for any help or suggestions!
Ryan