I googled Resun filter, which was mentioned in the setting up a
canister filter thread. They're incredibly cheap in Australia, and the
pictures look good. One site that came up from the US belongs to a
poster on TFA: Carl! Here's the link:
http://americanaquariumproducts.com/...werFilter.html

Carl is only carrying the HOB model as far as I can see. Have folks run
into unusually-branded filters or other products? Attractively priced
ones? Do you have any comments? Tommy recently did a spreadsheet/
survey of some filters, but I forget the link.

The products I'm familiar with are Hagen, Eheim and Marineland. Rena is
still a new name for me. In the old days we had Dynaflow, Hartz
Mountain, "Miracle" UG filter and others...
d.