Two or three times a week there is an insert in the local paper touting low prices at hh gregg, appliances and electronics. This may not always be the case. Today at the local store I bought a Free Agent/Go Dock to hold my external disc drive for $19.99.
A short time later I was in the Best Buy store and found the same product for $4.99. I bought one there also and later returned the first one to hhgregg.
I am not sure how you explain such a price differential but it obviously pays to have some idea of what something costs before you shop.