No, Georgia, wasp spray is not even worth a mention, much less "legitimate." The active ingredient Pyrethrins, which are insect nerve agent poisons for insects, are only mildly poisonous to humans and are OK for topical application and simply are not effective in stopping intruders. They are, at best, an irritant that may just make the attackers angry enough to kill you when they merely intended to rob you. They will not incapacitate or temporarily blind them like Pepper spray will. The use of wasp spray, even though Snopes gives it a liberal pass, is an urban legend. If you don't want a gun, you need a very directional, good range (15-20 feet), capsaicin spray with a high Scoville rating, the higher the better. The cost of these is a reasonable $8 to $16.
Yeh I hear ya. I was trying to be kind. We have some Bear spray which will wind your watch but its out in the garage in our backpack. We keep the real meal deal on each bedside table. There is no substitute. :-)