Hi. Looking for a small self contained focusable dot laser module, 635-638nm, 200-300mW, external power supply (not battery driven) suitable for 110V plug-in. Thinking bullet type 20-30mm diameter and 50-100mm length. Short, intermittent bursts so heat build-up shouldn't be an issue. If it can take a beam expander, that would be a plus, but not needed. Amazon has a few through Sunshine-electronics but no reviews I can find there or here. Anyone know of them? Or any other solid website to look at? Sanwu and Laser Pointer seem favored here, but I don't see this product at either. Thanks.