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Re:Nexus 4 available for purchase again today at 12pm PST by rickymm3 on Tuesday November 27, 2012 @04:07PM (#4839030)
It only leaves your cart if you refresh the page while the other page turns to 'out of stock'

So my advice is to not refresh the page. Keep 2 tabs open. If you get the 'there was a problem' message...go to the other tab and refresh THAT page until its back.

Then head back to the cart and continue pressing, "proceed"

Re:Nexus 4 available for purchase again today at 12pm PST by rickymm3 on Tuesday November 27, 2012 @04:11PM (#4839065)
it also takes the ajax roughly 3 seconds to run. So click every 3 seconds to ensure youre not cutting off a form submit that was going to take you to the ordering page.
Re:Nexus 4 available for purchase again today at 12pm PST by rickymm3 on Tuesday November 27, 2012 @04:17PM (#4839106)
also helps to have firebug open. It throws 3 posts. once they are done, hit the button again.