Door seal rubber - What to buy in UK

Hi folks. I have my studio doors hung, but haven't installed the door-jams yet as I'm trying to source rubber for my door seals, in the UK. I've found a few places online, but there prices are really high. Does anyone have any cheap alternatives or can recommend any websites etc? Thanks v much! Oh - editted to say, is this the kind of thing I should get ? http://www.theaishop.com/ironmongery-products_Acoustic+Door+Seals_Perimeter+Door+Seals-105-107.html