Myfrogger,
I started at the eBates.com site and followed their link to the giftcertificates.com site. I then set up to purchase 2 $2500 supercertficates with myself and the giftee. When I got to the checkout the coupon code (not supercertificate code) was enterted there and I got the additional discount 15% with the code.
Then using their 10%off200, I bought specific certificates from Blue Nile which got me 27 $1000 certficates for each of my $2,500 supercertificates, with $70 left over from each. Which I used to buy Starbucks gift cards.
It worked without a hitch for me.