I traveled around the Philippines for 2 weeks and spent a total of $1,155 USD. At no point did I feel like I was living on a tight budget – in fact, we splurged on most things and stayed in nice hotels and hostels.
Bali has a reputation for being an excellent location for this and not too long ago, The Guardian named Ubud, Bali one of the top 10 yoga retreats in the world.