Safety Deposit Boxes?

We have been living in Puerto Vallarta since August 1st of 2011, and have a question that hopefully someone can answer for us:

Are safety deposit boxes available in Mexico? If so, where?

We have seen numerous posts on the internet regarding the availability of safety deposit boxes at hotels, for use by tourists who need to store their valuables temporarily while visiting Mexico, but what about those of us who live here?

It doesn't appear that banks generally offer this service here, like they do in the United States.

Since there has been one break-in attempt to our condo already (unsuccessful, however, thank goodness), we would like to find a business that would offer safety deposit boxes for rental, to use in storing our passports, valuable papers, unused checks and credit cards and other valuables.

Thanks for any information you can provide.