I've never heard of Survivalpax nor know if they're reputable. But apparently they have a 4seven's sale. Cheapest I've found a quark aa. They might be getting rid of the old stock with the old brand design. I liked the old branding anyways.
Quark aa: http://www.survival-pax.com/4Sevens-Quark-AA-R5.html
Other 4seven's stuff: http://www.survival-pax.com/4Sevens-Flashlights.html