If you are looking for an excellent quality, and affordable, regulated squonker that uses 18650's with the included sleeve, look no further than an Eleaf Pico Squeeze 2. The Squeeze will also take 20700 and 21700 batteries, should you ever feel the need.
They are very solidly built mods (no plastic parts). Tough too, my German Shepherd has sent mine flying more than once with her tail. I have three. Have had zero problems or issues.
If you like temp control vaping, the Squeeze 2 can be upgraded to near DNA chipset quality via the
Arctic Fox firmware. I've upgraded mine.
Eleaf US has them in-stock for $49.99 (comes with a spare bottle). It's the only place I know of that has them in-stock. They sold-out elsewhere fairly quickly. Folks who own them love 'em.
Eleaf Pico Squeeze 2 with Coral 2 kit, an upgraded version of previous Pico Squeeze kit, is a new regulated Squonker that features an easy-to-squeeze silicone bottle and a decorative 7-color LED. The refillable Squonk bottle can hold an ultra huge amoun
eleafus.com
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I purchased my last one from Eleaf US. Shipping was quick.