I got this sleeping bag a while ago:
Latex Sleeping Bag 0.8.mm
Custom size was available at the same price (might still be), and so I sent my measurements. They made the bag exactly to these measurements and therefore it fits well without stretching. Actually, slightly tighter might be nice too.
There was no trouble with the seller, and even customs waved it through, it came straight to my door.
Quality seems fine, 0.8mm latex feels secure and with a "three-way-zipper" (three sliders) on the back, it is a great toy. Zipper quality seems good too and the sliders can hardly be moved from the inside, which requires a string for self-bondage. And there is no hassle with a bending collar, because you can open the middle slider instead of the upper one, get your arms free and then the rest.
Very nice toy, easy to get in, a bit harder to get out, but as safe as the string on the (center- or bottom-) slider.