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Does anyone have any online stores they use and like to buy turtle supplies like water heaters, water filters, etc?

TIA

General supplies:
http://www.bigalspets.com/
http://www.drsfostersmith.com/

Specialized:
http://www.lllreptile.com/
http://www.carolinapetsupply.com/catalog/

Filters & media:
http://www.aquatraders.com/

Don't forget home depot, lowes and your local hardware/plumbing stores too. Ebay is a good place for hard to find inexpensive supplies as well.