I wonder what you've found so far. It looks like most requests for help here go unanswered. Maybe there aren't that many active members as it might seem. I've been trying to put a 500w LED project together. It's been taking me years, procrastination mostly, but I'm hoping to finally get it done. I've had to do and learn a bunch of different things working towards this project. Anyways, trying to answer your question, the most affordable options are the not so reliable ebay ones. I've seen some other that are 2 or three times more expensive, but not necessarily more reliable. When I bought mine on eBay it was about $120, not they're about $80. I hope that helps.