https://www.amazon.co.uk/S30R-III-Rechargeable-Flashlight-Waterproof/dp/B01N0NO0VL/ref=sr_1_1?s=electronics-accessories&ie=UTF8&qid=1496912419&sr=8-1&keywords=olight+s30r
https://www.banggood.com/BLF-X5-XPL-HI-1400LM-EDC-LED-Flashlight-14500-p-1031451.html?rmmds=search (you'll need a 14500...
Olight S30R is a better all round torch and is 80% brighter. Strobe is a couple of clicks though, rather than the Klarus' one but it's a terrific light.
Alternatively, for a cheapo, the BLF/Astrolux SC from china is a good torch; more than twice the brightness of the Klarus at less than half...