Jail is not common for a small theft crime, even with one priors - though a Judge could execute some jail time. The real problem is living with a criminal record and the thief label forever. Work with your lawyer.
Generally speaking a theft of this nature would likely not result in such sanctions. However, since this is your second in such a short period of time you do want to proceed with some caution. I would speak with an attorney prior to your court appearance. In addition, take the opportunity to speak with the prosecutor prior to entering into any plea to see if you can reach an agreement prior to resolving anything. Good luck!
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but instead need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights