Cascadia ImPorters represents Coopers homebrew in the US ,Retail customers can buy directly from their Website and they have a full range of kits and extracts and probably where you will find the freshest Coopers Kits,
http://makebeer.net/Brewcraft's kits that Jamil mentions on the show are also available in the US through some retailers.
http://www.brewcraft.net/wawcs019608/id ... 1/USA.htmlThe Brewcraft range is produced Muntons in the UK.
Coopers on the other hand is a family owned brewery in Australia who has produced bottle conditioned ales for over 100 years.Coopers have been in the home-brew industry since 1978 where they started with 15 liter (4gallon) wort kits packaged in a bag in box and sold through hardware stores originally and a handful of homebrew stores and heath food shops.
Many of the Brewcraft pre-hopped kits have iso-hop in them but they do have the Rouge Ale Kits also that are great quality and where developed by John Maier himself .
Coopers actully boil the hopped wort and evaporate it .Some of Coopers Brewmaster range has hop essensences added at packaging .
As for customizing kits the possibilities are endless even for the begginer from adding a bit of late hops to steeping grains in some hot water or making a hop tea.
Kit beers keg really well also and can be ready in 10 days with a good fermentation and a couple days of cold conditioning .