Sound Storm Labs is a division of Boss Audio Systems. Boss Audio is probably part of the Sound Around corporation, which is responsible for Pyle, Lanzar, Pyramid, Legacy, and most other cheap-as-all-hell audio.
With a budget of $50 per sub, buy used. The way car audio works, a little scratch or tear or scuffing can ruin the resale value but not the functionality. Who cares if you sub has some chips in the magnet or a fixed screwdriver puncture in the surround when you're only paying 20% of the retail price? You can always upgrade later.