Is that for the rims WITH the tires? If you don't want them, see if he will take them off for you. The loss of weight and size will dramatically decrease the price - I shipped a set of Borbets from Virginia to Chicago earlier in the year for about $150 I think, and surely GH would be less. True it will cost him to have the tires removed, but then he can sell them separately and make more money.

If $400 is for the rims and tires, I'd offer him $300 for just the rims.