I am not sure (because I don't have a PGL),but I think your local camera store would have one that would fit.I think it would be a standard size,if it is then wallmart would even carry them.
Joe
Edit,I looked up your laser,and I see it does not have a threaded hole for tripod.Could you go to a bike shop and buy a mount to attach a flashlight to your handlebars,then attach it to a tripod?