I bought mine at home Hardware, but I am sure if there is a home DEpot around they will have it too, you can always get it from the website (in my first post)
It really is amazing, and even if you don't see any bugs it is a good preventative, in under the carriage or the basement, catch them before they get a chance to get in.
Like vitamins etc prevention is the name of the game...
(sprayed on fabric, carpets drapes, it works for a few days...)
I haven't found anything that works as well (even stuff from the vet) and I live in cow / horse country ... pretty persistant flies... but it kills all the creepy crawlies and the flying ones too, you will never need another 'bug remover'