Hi there, my youngest child was breech for a couple of months fairly late on, probably later than you are now.
I saw an osteopath, also a friend of mine, who specialises in treating babies and pregnant women. No osteopath should ever claim to be able to 'turn' babies; however, a few days after my appointment, my midwife found that she was no longer breech! 
If you're anywhere near South London, I'd happily recommend him.
You could also try moxibustion (Chinese herbal medicine), diving into swimming pools (anecdotally worth a try!) a and the website 'Spinning Babies'.
Good luck! It's also completely possible to give birth to all kinds of breech babies vaginally, but because the automatic advice is elective c-section, most midwives have little/no experience of vaginally breech birth, so don't feel confident to support women in them, which itself perpetuates a vicious circle of cumulative de-skilling in this area - a great shame 
Breech Birth by Benna Waites (I think) was well worth a read too.