Mars hydro has Amazon listings. Just make sure you buy from Mars hydro Ltd. Or lgledsolutions Inc. I got mine from eBay from lgledsolutions and Tina/Sarah had me updated on the specifics and shipping details.
Hope you get you LEDs, they make a huge difference in flower.
Squeeks if your using the bud brute you could probably get by with a full spectrum UFO type led.
Cheers
Edit: pm smokesarah and see what she'll price out. Shop around there's deals to be found.
Yes I have talked to tina and grace and they do have listings as you described on those sites but it it actually cheaper to order direct in most cases and you are 100% sure to get the real deal. I did buy my mars 300 off ebay from Mars hydro Ltd with no problem.