GE is very expensive. Pentek manufacturers many filters for GE, Culligan, Ace Hardware, American Plumber, and more brands.
The RFC-BB is actually the same filter but with the Culligan label. There are quantity discounts so it will make it cheaper than Home Depot for you.
http://www.waterfilters.net/Pentek/wholehouse/Carbon_Filters/RFC-BB.htm
The FXHTC and RFC-BB are industry standard 10" L x 4.5" W filters. You can actually use any of the filters on the following page if you would like:
http://www.waterfilters.net/culligan/wholehouse/replacement_filters/Wholehouse-10-Inch-Big-Blue.htm
The filters listed first are only sediment filters and then the carbon filters are listed later on the page.
Thank you,
WaterFilters.NET