I've been gathering reports of Thai surgery costs, including 1 month in Bangkok, food, lodging, air fare for two, etc.
Given that almost all Thai surgeons, except Suporn, price GRS around $9000 US, give or take a few hundred, and other miscellaneous costs added in bring it to $14000-$15000 total.
Then FFS - again outside the US for moderate FFS would seem to be in the $9000-$16000 range typically and many of these international surgeons are quite good at what they do.
So going abroad from the US would seem to suggest $35,000 could do it, theoretically, though it might be tight. If you're going to stay in the US, I'd say $50,000 to $55,000.
Consider that GCS from US surgeons does not include lots of other expenses, so that $19,000 or so becomes almost $25,000 when air fare, lodging, and other expenses are added in and likewise for US FFS surgeons.