Two like new Cooper discoverer tires 275/65/20

Bought from Dan tire there's nothing wrong with the tires except they're the wrong size for my truck they have less than 300 miles on them I paid $1000 to have them mounted and balanced Will sell for 550 or best offer. Also, I'll be heading through Dickinson and Bismarck in the next few days if anyone is interested in the tiresI can just bring them with.