Fettpride has the most accurate jetpack and gauntlets available. He does have a significant wait time though. High quality stuff, i think he offers both full vac'ed and fiberglass versions of the gauntlets. His packs are fiberglass and super accurate to the film.
MOW does both Jetpacks and gauntlets and aside from being on here, he also has an E-bay store. Manofwarstudios both here and on e-bay. resin cast nice stuff.
IOA/RKD (red krayt Dragon here on the boards) Makes a great set of gaunts as well. Resin cast with a super durable inner coating and vac'ed bottoms for easy on and off.
I may have 1 or 2 jetpacks available after the run, depending on supplies i have left. My pack is fiberglass, i have a sale thread in the cargo hold(DVH). I will have a few sets of gaunts in the spring, they currently are not completed yet.
RS props and Bobamaker also offer these items. They are UK based though, so assuming you are in the US, shipping cost may be a factor there. Both make excellent products