So, GamersGate also has an Elder Scrolls week, where at least Morrowind and Oblivion get real discounts.
I'm not sure what the prices are in $, but since the prices in were very low even before the sale, Morrowind GOTY is 2.87 and Oblivion GOTY is 4.89. I had the IGN 15% discount so I just got both for 6.60.
They decide currency by IP and store it in cookies in my experience. I don't even have an address stored there and pay by PayPal, so a proxy might work.
Where do you live? Here Morrowind is 8 and Oblivion 10.