Sorry I can't help with where, but in answer to your question, yes you can.
Hopefully this'll help:
Take the car to kiwk fit (stay with me), they used to have a "no refil, no charge" system.
Basically, they'll vac and then pressure test the system. They'll find a leak, then run a dye through to detect it.
Then offer you a HUGELY overpriced repair and you say "no thanks, can't afford it".
Then, due to the system being empty, you can work on it yourself. Find a breaker,and get the part you need for a few bob, fit it, and head back to kwik fit.
Sorted.
Hope that helps.