Actually a simple tungsten bulb with an appropriate filter will do the job. It puts out about twice the IR as visible light.
Something you might want to try when you get the IR viewer is an old safelight housing with a sheet of black plastic stretched over it. Often the black plastic is pretty transparent to the IR as the black is a dye incorporated into it. If its colored with carbon black it will be IR dark too, a little experimenting will tell you which is what.