Need help finding LECs? or CMH 315

I grew 10 plants on 3 CMH 315 watts
I now need one more (at least) maybe two very soon. Has anyone used Horticulture Supplies or Supply Co. I can't remember how to find them or a link for a good deal. I am trying autos and I need the heat from these lights.
Many Thanks

Maybe https://www.htgsupply.com/

Google 315 cmh Many many companies producing them at many different prices and quality levels.