I have a similar story about patio furniture. The store, a large national hardware chain, had the patio chairs for $24.99, tables were something like $150 with umbrella.
I went to the store, asked for some help, the guy helped me load 6 chairs and 1 table onto a cart. I went to pay and the helper guy left to...I don't know, just left.
The cashier scans and says, "That will be $26.74." (ie. $24.99 + 7% tax, the cost of one chair) Needless to say I was shocked. I asked her to scan again, so she did. "26.74"
A lady who was near the cashier then says, "What's the issue?" "He just asked me to rescan." The nametag on this new lady said, "Asst. Mgr."
So I say, "I have 6 chairs and one table set, can you scan once more?"
This Asst Mgr scans it and says, "Yeah, $26.74."
I put away my credit card, paid cash and got out of there...