Could have swore I saw some at either Academy or the Grapevine Bass Pro the other day.
a lot of places carry devcon but it's the 5 minute kind. make sure it says 30 minute. with that you really only have about 12-15 minutes of real working time before the stuff starts to set up.
i put 2-3 drops of alcohol in a mixture for one or two baits and it helps keep the epoxy workable a little longer and it thins it just enough to make it brush on much easier.