1. serached a cheaper SSL certs seller on Google.
2. found "CheapSSLs.com" and went there.
3. thought which is better "Geotrust Rapid SSL 9.95/yr" OR "Comodo PositiveSSL $8.95 ?"
I selected Rapid SSL. becuase PositiveSSL is 1024 bit, it's samll.
4. thought which is better 1 year or 3 years or more?
I choosed 1 year. bacause in the next year, it'll be more chaaper.
and I'll be able to try it again.
5. Buy, it is very easy.
6. Next I must activate it. but my old SSL is not still expired,
It'll be expired After Dec 17 16:07:40 2010 GMT.
to be continued.