How to sell $100 best buy gift card that I desperately don't want?

I have a best buy gift card worth $100. I do not want it since the company screwed me over bad. I had an iPhone that was stolen in a robbery. Best buy in store told me I couldn't get a refund for my geek squad plan. They said call 1800 number. I did this for 6 months. Finally the store refunded it but only the prorated and on a gift card. I would rather be castrated than give them another penny of my money. The problem is my family isn't a tech family and prefer wal mart. How can I sell this and wipe my hands clean?

Added (1). Can't sell them their own card

Sell to bestbuy: I

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