Looking For Software To Log Sales

[Thunderchild]

I'm a sole trader and sell stuff on ebay, quite low value and 4+ sales a day. I'm also looking to start my own online shop. At the moment to log my sales and work out profits per sale totaling up each month on a spreadsheet with one tab per month. So I'm doing a lot of inputting.

Is there an easier way to do this ? i was thinking of setting up a database but I don't know how to do that so would not want to screw up my accounts.

Basically I need a system that will have preset prices per item type so i can select what was bought put in the sale value and get the monthly tally. With up option to update product purchase price without affecting the stuff sold on the old price.

Any cheap / free software out there to do that ?