Bulk reef usually sells them on the "deal of the day" sales. At the end of the day, unless you care about aesthetics, you're really only concerned with the filter type........they are for the most part interchangeable. I look for one that has a low cost of use. Readily available filters, replacement parts etc etc.
Also, check your towns water report to see if they use chloramines in the water and if so, you'll need that kind of filter. Its also good practice to add a DI stage as well. Bulk Reef, Air water ice and a host of others have a lot of options or let you customize.