Looking for good source of carbon blocks

Hey just wondering cause I go through 30-40 of these a year dripping in my rays tanks ,

Anybody know a really good quality source and price . Ive been buying out of Florida but they are cheap quality 1 micron carbon blocks . They break really easy and I'm just looking for ideas possibly within Canada but USA is ok .


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I get them off eBay too buy they don't come out no ware near close to $2.50 each and I usually buy a years worth a time .


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