I've managed to get every part, most in multiples, thanks to friends who go frequently enough to do that for me. I've mixed/matched some parts with the multi-pack parts too, to make a pretty seemingly endless variety. Throw in some Hasbro BAD parts too and it's even better. Add to that some minor "customizing" to parts I had plenty of and it can get even more absurd.
It sounds like this recent trip has me 100% caught up on parts at this point I think. That's a good feeling... It'll end as soon as that R5 pack comes out.
I'd love to have some extra parts to swap onto those too. I already have a slight plan there.
I wish they had more "generic" domes readily available all the time, regardless of wave. A solid white, solid silver, and perfectly clear R2-R3 dome would be neat things to have, from a customizing perspective. I could see buying many of the bodies and just slapping those "generic" domes on. I'd probably rebuy MANY of what I already have, actually.