Time is of the essence! Flog 'em! You should get them out there quick smart before everyone sees this thread and floods the market with their stock alloys.
I imagine you're probably not too upset about this either, you've a bit more coin for upgrades.
That's about normal ripoff for standard alloys, you won't get that much for a whole set second hand though.
Try selling them 1 at a time, I bought a full set of brand new 2012 alloys on eBay as I wanted a second spare, paid $800 for 4, sold 2 at $300 each, I kept the other 2.