Hm. Sorry I lost this thread and found it again tonight (though my question doesn't really belong in this forum).
Add Item to Cart -> OK
Check Out -> OK
Log In -> OK
<enter cc information - shipping information already on file>
Submit Order -> ERROR!
"Error Message
All orders must be placed through Newegg.com's provided checkout process. Please visit
http://www.newegg.com to place your order."
which of course I ran through again with the same result.
Cookies and javascript enabled.
I fired off an email to newegg, but they wouldn't even say they did or didn't support opera - just gave me a number to call. I can do that of course, but I was holding off, because if it was an opera issue, I wasn't going to give my money to a company that doesn't support Opera users.
Apparently it is user error though
