Amazon offers its Prime members the Stanley Lighted Shock-Resistant Torpedo Level, model no. 43-512, for $6.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise shipping costs $5.18.) That's the lowest total price we could find by $12. It features three lighted vials with automatic shut-off.

Note that this item is expected to ship in three to five weeks.