Sorry - seems it's a pretty rare light. I and couple others have the FandyFire K2 or equivalent and I'm very impressed with it - side switch 26650, very close to this form factor, but I'd say the K2 will be a better quality light. Here: https://budgetlightforum.com/t/-/20035 and here: https://budgetlightforum.com/t/-/20458 and here: https://budgetlightforum.com/t/-/20787.
FastTech seems to have the best price of the major resellers: http://www.fasttech.com/products/0/10005048/1396700-fandyfire-k2-cree-xm-l-u2-5-mode-890-lumen-white-l.