I got out
What I'm about to offer is good as a last resort, it worked for me, but i'm not a lawyer, and I'm only sharing this for those of you who are desp, and really want out of Sprint.
The only way I could find to get out without paying the ETF is to call sprint and tell them you are moving out of the country for a job relocation or something. They will ask you to prove it with an apartment lease, or utility bill, etc. The utility bill is hard to prove, but you shouldn't have a problem creating a lease agreement with a family member who lives abroad, etc.
In my case, I used an apartment of a friend, and made it all legit, and they let me out without paying ETF.