The red s2+ for $13 is hard to beat with nice 4300k tint. Just not in US. [NO COMMENTS OR DISCUSSIONS HERE!] The BLF Deal Alert Thread
The convoy clip is ok for pant pocket, but definitely weak grip for a shirt pocket or any thin material.
Convoy Taschenlampe Clip Für S2 S3 S4 S5 S6 M1 M2 C8 Taschenlampe Sale - Banggood Deutschland Mobile-arrival notice
But, I think the S8 for $18 is really what you want. Includes clip. Has more spot, not full food like s2+. Select the 4C tint, apply code BLF at checkout.
http://www.banggood.com/Convoy-S8-XML2-AK47-71358-Mini-LED-Flashlight-p-908421.html