Got an offer for my stock Rim/Tire
 

I just purchased an 05 silverado 1500 LS and I'm getting new rim/tire/lift package set up in a week so I decided to start putting ads to sell my stock rims and tires (17" w/less than 2k miles).

I put the add up and got a quick response from a guy offering to buy them for $400. Is that a very low price for a practically new rim and tire package or should I be getting a much higher price for it?