I had to keep hitting the "Proceed" button dozens of times in order for it to succeed. Finally got the Google Checkout popup to work properly and completed the

I had to keep hitting the "Proceed" button dozens of times in order for it to succeed. Finally got the Google Checkout popup to work properly and completed the order. If you see it being marked as sold out, refresh or clear cookies. Apparently it's a caching issue. Edit 12:10pm ET: caching doesn't seem to make a difference; may actually be sold out now. Surprised at (a) high demand and/or low inventory, (b) that Google struggled to keep the site responsive.