I was going to recommend searching, but figured I would just add this:
Well, I got a 522 off ebay (they have to never activated, brand new, never leased etc) units. No front line CSR would help me check the R and S numbers so I had to go on faith as by the time I would of got a response from CEO the auction would of ended. Basically, make sure it's a reputable seller on ebay and then email the CEO address the info. They still won't do it for everyone, but from what I have read and seen is that if you are paying about $80+ a month, they activate it, people with lesser subscription rates have a harder time.
I am not saying this is the fact, just what I have seen. It took about 2 days to get my 522 activated after my 1st email to CEO address.