If nobody does, you can get cheap unbranded Chinese ones off of eBay for not too many bucks. They are not ATI, but they might work to test out what you are looking for.
When you get them, they might need 4-6 weeks to color the coral up a bit - they are not just like a ReefBrite that illuminates only, but they can color coral too. This might not be too much since your MH already has good spectrum, but it can be some.
