Any powder based insectocide would be better than a spray. Seven dust is pretty easy to find, most stores sell it.

Seeing as how it's getting on flea season here and I've got a house full of critters, I take my inverts and reptiles into the bathroom, cover them, close the door and dust my carpets at night before I go to bed, then vacuum the next morning but leave all the "kids" in the bathroom for an additional day...and another vacuum. They've never had any problems.

The main thing you want to do is just make sure your inverts are as far away from the stuff as possible and that, if it is not being vacuumed up, that when a breeze comes by, the dust can't get at them.