I definately would NOT run deca by itself mate..... alot of people have done so in the past and it generally doesn't pan out well. Especially because you are in your 30's..... deca can be a little harder to recover from. It sucks you can't get any other test..... it just doesn't make much sense. One would think your source would carry Test E if he's got deca and test prop.
I would probably recomend an 8 week cycle of test prop..... it's a nice short blast cycle that you should be able to recover from fairly easily. If you find that 8 weeks of injecting everyday wasn't too bad then maybe consider a 12 week test prop and 10 week deca cycle for the next one.
I would hate to see you start the test and deca only to wanna stop the everyday injections 6-7 weeks into the deca and then still have to continue injecting the test for another 2-3 weeks.
~Haz~