90% on eBay seems a bit high, especially since (until recently) you could buy them from a real company for that discount, without taking on the risk of non-delivery by the seller.

I've bought about $4,000 of certificates and upgrades on eBay this year, and my average discount runs 25-50% off the face value.

Contact me, since I'll probably be bidding for them on eBay if you post them.