Back in the 90s HMV used to accept returns for exchange without a receipt. They were more expensive than our local indie shop but had far more choice. So, I would regularly buy a CD from the local shop at the lower price then return it to HMV to exchange for the one I wanted.
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Friend of mine bought it at a Cex for £17 across the street and then traded it in to the HMV. All to save £3.
Dedication to the grift.