After rereading you original post, I see that you are overwriting the price. You need to set up your tables correctly and use the power of relational databases.
You should have an Item table which had fields unique to an item. Something like
tblItems
itemID (primary key, and could be an autonumber)
itemDescription
otherItemFields (photo, category, make, serial,....)
then have a one to many table of prices, because you will have many prices for each item.
tblItemPrices
itemID_fk ( a key that relates back to the tblItems)
curPrice (a currency field for the price)
dtmPriceDate (a date field, for that price)
Using queries you can bring it all back together linking the two tables by itemID.
You would likely have a Main form for the item and a subform with the related prices for that item. You may want to look at the Northwind demo that ships with Access.