In the long run a captive bred snake is your best bet. I understand your feeling about catching your own snake but they can be much more costly than a captive bred snake.
Parasites and other unknown problems can end up costing a lot.
Not to mention the problem taking wild snakes can cause to population.
Just something to think about.

If you every get to C.B. give me a call and stop by to take a look at some of my snakes.
I'm sure I could help you out with a pair.