Yes, they will all have monthly fees.
Paw Tracker - Memebership Fee is $9.95/Monthly or $99.95/Yearly
KYON - $4.99/Month
Buddy - looks like they don't know yet... "Buddy GPS will require a SIM card in order to track your dogs whereabouts. At the moment we are working out a deal with a variety of telecommunication companies around the globe to see if we can strike up a good deal for our customers. For our Indiegogo fans Buddy will be unlocked so you will be free to use a provider of your choice!"
This is probably my favorite since it's designed for cats (
http://www.pettracer.com/en), but there's no release date. Right now I'm leaning towards the KYON. Since the KYON isn't scheduled until November (and that could change) I'm hoping the Pet Tracer gps cat collar will have an update by then on a release date. I really do like the safety buckle and it's lighter.
I'm not sure attaching a collar to the walking jacket would work well for Shango. It'd be kind of bulky and he still occasionally likes to bite at the leash, he's getting better at leaving it alone though. I'm thinking the collar would be fine as long as I only put it on him when walking him outside. If the worst happens and he somehow gets off the leash, I will immediately be tracking him so hopefully I'd find him before he had the chance to get the collar caught on anything.