Which episode in storage wars is a locker sold for 2.50?

There is no documented episode of Storage Wars where a locker was sold for $2.50.

Storage Wars is a reality show that features buyers bidding on storage units, and the prices usually range from hundreds to thousands of dollars. It's unlikely a unit would be sold for such a low amount.

It's possible you're misremembering, or perhaps you saw a clip from a different show or a scene that was edited or staged.