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In my experience, car audio direct ia the best place. they have a forum for audio questions too with lots of people who know their stuff. the customer service is great, all other online places have been lukewarm in that depertment
Or ebay if you know what you are afetr and trust the seller. I got Dynamat Extreme Bulk Pack for 110 quid and my brother got some for the same price and some Diamond Audio Hex S600 speakers for 229 quid.