Here you go, this should set you up with a plethora of marine goods. http://www.marinewholesales.com/
go to www.monster-deals.com they have the best deals on electronics. or you can go dealsourcedirect.com for very cheap prices on all electronics specially on marine electronics
for example on ebay or dealextreme
For the most part, marine electronics are waterproof. You can find great deals on waterproof marine items by visiting http://www.bizrate.com/marine-electronics/waterproof-radio/ or even amazon.com.
You can buy them at most electronics stores or online.
Marine electronics are best used for items that would be ruined if used in or near salt water. Marine electronics are almost always waterproof, as well as water resistant.
Probably an Electronics or Music Shop, or online on trusted sites.
Square D breakers can be bought online on various websites that specialize in the electronics and electronics accessories such as Best Buy and Amazon.
You can purchase a MIDI interface online or at an electronics store. In order to purchase one from an electronics store, try going to Best Buy or Staples. To buy online, try NewEgg or Amazon.
You can buy rash vests online from the Surfing-Waves website. Alternatively, you can get these vests online from the Gill Marine website or from Amazon.
Canadian Electronics Vapor has stores across Canada, but more importantly they do business online as well.
PC 3200 memory can be purchased from online computer and electronics retail sites. One example is Canada Computers & Electronics. They can be found at www.canadacomputers.com.
Garmin Fishfinders are widely available at a variety of locales including Walmart, Target, electronics stores like Fry's Electronics and Best Buy, and fishing or underwater supply stores such as Scuba Store, BoatersLand, or West Marine. Of course, they are also available online at Amazon and eBay.