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Plumbing supply stores
Not sure if you can buy it locally; however a good online source is Garden Harvest Supply. I have added a link below.
There are several great online catering supply retailers both locally and online. I would suggest checking out the deals at www.BigTray.com.
You can buy business card storage boxes from many different places online and locally. Locally, try office supply stores, Target, and Wal-Mart. Online, try vistaprint, Staples, or Amazon.
Any plumbing supply that sells fixtures
Vellum envelopes may be purchased locally at office supply and party supply stores. They may be purchased online from Paper and More, Hobby Lobby, Limited Papers and Amazon.
You can buy a conversion kit from your local Plumbing supply store.
Locally, I'm sure you can get one from a neighborhood pool supply store. Online, you can check amazon, eBay, or even craigslist. Otherwise, online, there are many pool supply websites selling pool heaters. bestbuypoolsupply.com is one website.
plumbers tape, for securing plumbing pipes to wall /floor stus etc. try a plumbing supply.
www.ltrplumbingandheatingsupplies.co.uk
Chemical supply houses. Most of them only sell to businesses and schools. You might be able to get it from a plumbing supply store.
Northern Tool Company has an online website and their hydraulic pumps can be purchased directly from them. The pump is also available on Amazon and from most plumbing supply stores.