It depends on whether wants a personal or professional dispenser. Personal dispensers can be found for under $100. For a professional dispenser, one should expect to pay about $500 for the cheaper versions.
You can find many cheap soap dispensers. Wal-Mart is a great place to start. They offer a large variety of dispensers and colors. Shop around for the best deals available.
You can look online at a few places. I'd look on www.amazon.com and www.ebay.com first. If you can't find what you're looking for there try www.soda-dispensers.com.
http://www.samsclub.com/sams/shop/product.jsp?productId=176453&pid=CSE_Froogle&ci_src=14110944&ci_sku=184515 sells soda dispensers for some good prices.
You can find a soda fountain dispenser at www.sodabarsystem.com/. E-Bay also has soda fountain dispensers to bid for and to buy.
Yes there are several Refrigerator Soda Can Dispensers that can be had at your local Walmart. anonymous@oola.com
Soap dispensers can be relatively cheap if you are not looking for designer style. You can find regular soap dispensers for your home in the range of $5 - $10. If you have particular tastes you may pay more for a designer soap dispenser, approximately $15 - $30.
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Dispensers dispense soap & are by the sink(s).
Dispensers are manufactured in companies, such as Brentoma, Aquaid and Wizcom. Water dispensers come in different sizes and with or without cooling systems.
Plus the soda? A can is worth little more than a few cents. Tin is cheap as, thus cans are worth little.
No. Technically you could, by bubbling carbon dioxide through sodium hydroxide, but why would you want to when baking soda is so cheap and so much easier to get than either of those?