Yup, to be honest my local fish store (who only deals with marine fish) only stock super expensive LED
units too. Luckily they can give realistic advice like, search on eBay etc... I believe the cost difference comes from the type of led
chip that is used in the units - the units on eBay are the Chinese version and by all accounts are just as good as the top shelf ones. Again I would recommend before you buy to post on here with the specifications first, just incase you are missing something (technically) Where abouts do you live? In Brisbane city? You would think up there would have some good aquariums that only deal with marine, I know some good ones on the Sunshine Coast...