PyCon US is again offering assistance to delegates who may not be able to cover their own travel and/or accommodation costs. Applications have now opened, and the announcement page contains a link to the application form (separately linked here in case that's all you need).
While there can be no guarantees of financial assistance I can think of many delegates who have enriched the conference by their presence only because they received assistance. And those from places where few people even travel abroad can attend and set minds on fire when they return home. So financial assistance is a real investment in broadening the Python community, and I hope it will continue to be so.
There's a deadline, though, so don't spend too long thinking about it!