Generally speaking there are few decarb only kits. Decarboxylation is one of two steps needed to make an edible cannabutter. Most cannabutter kits will provide the tools necessary to do the job.
Butter Bagz™ does both the decarboxylation & the infusion.
There are also electronic gadget options that decarboxylate and infuse your precious green. Some of these gadgets are stove-top systems that have no true heat regulator and this can be extremely damaging to all of your hard work. Some electronic appliances work well but have very small infusion reservoirs and in some cases the calibrated heating coils are not accurate possibly disturbing a good infusion.