Free long term yoga study?

Greetings,

I’ve been regularly practicing yoga for a few years now and am strongly considering devoting a year or two of my life to intensive study, however, I don’t exactly have my pockets overflowing with finances and most the long-term places I’ve found seem to charge quite a bit (at least when it keeps adding every month…). Is there any reputable ashram, yoga center, etc. anyone knows of (location doesn’t matter) that one can do some sort of work exchange and sustain oneself mostly free of charge?

Thanks much,
David