How about the WIsmec Skyladon?

The Skyladon is an inexpensive all stainless steel mechanical mod. More specific introduction at http://www.wismec.org/skyladon.html .The main features, or selling points of the Official Authorized Wismec Skyladon 18650 Battery Mechanical Mod are its spring-loaded connector in the top cover and the magnetic fire button on the bottom. As for its styling feature, it has unique grids on the top cover for improved heat dispersion.