I don't have any expereinced with Agora, but I can tell you that 2checkout usually is at fault in times like these.
I could only find this thread mentioning the dollar sign.. which I'm guessing is what you found as well:
http://www.agoraguide.com/faq/viewtopic.php?t=661
Quote:
2Checkout's new servers
https://www2.2checkout.com/2co/buyer/purchase
It was reported in a post that the above 2checkout server does not accept the $ sign in the price. I could not confirm this, as mine works fine with the dollar sign. If you transmit the dollar sign, and you get a "Invalid Parameter" error, in the Store Manager settings remove the $ sign.
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I think the best thing to do at this point is to ask Agora for help on their site, but apparently you have to pay for it?
