Extended warranty problem

I bought an extended warranty on a two pack of spot light cameras from best buy a year in March. When i went to exchange them i was told we had to pay a difference of $42 dollars b/c you could no longer get them in a two pack. This is very unfair and miss leading to spend that much money to pay that after an extended warranty was bought. I would like my difference paid back to me or the money i paid for the Extended warranty