United's Petsafe Program

[mcaffa]

Has anyone had any recent experiences with United's Petsafe program? I'm moving back to the States with my two cats in July. Technically, the idea is for me to fly home alone and have my husband send me the cats a few days later through Petsafe. But I've read conflicting information about whether or not I am required to go through a cargo agency. Neither the SENASA nor the Aduana websites mention a thing. Plus, I'd like to know what extra fees are involved in the whole process, aside from what United and SENASA charge. Any tips on where to get IATA-approved carriers, absorbent carrier pads, water bottles, "Live Animal" stickers, etc. would be greatly appreciated as well.