sears
Commercial refrigerators come in all shapes and sizes, from undercounter models that are smaller than household fridges to walk-in refrigerators that are actual rooms. However, "standard" commercial refrigerators are often about the size of residential refrigerators - they just don't have the freezer compartment.
Nobody
In Philadelphia, PA Atlantic Ice sells and repairs commercial refrigerators. This is their website and it has details about what they sell, and their repair service. http://www.atlanticice.com/inner.html
Commercial-size refrigerators are generally much larger than home refrigerators. Thus, commercial-size refrigerators consume more electricity and use more power.
Commercial refrigerators are very large sized or walk in types refrigerators. Most often these are found in restaurants or any location that has high volume food processing. Non-commerical refrigerators are you normal in home types.
You can find commercial refrigerators at Sears and the Home Depot. These places offer a nice selection, great prices and often warranties for your appliances.
There are many brands which sell commercial refrigerators but two of the best are " True" and "Turbo Air". Some lesser known are Traulsen, and Beverage Air.
Brands that manufacture under the counter refrigerators include kenmore, maytag, lg, samsung and many more. Most of them are usable for commercial spaces.
The commercial is for the Samsung refrigerators.
There are many makes and models for commercial refrigerators. Most of them last between 7 and 10 years. I always recommend shopping around for a good brand before purchasing an appliance.
I don't think that Excel Kitchen sells used appliances and refrigerators, they do however have discounts on brand new appliances only.
GE sells a few replacement parts for refrigerators that they create, including a replacement water filter as well as a replacement Defrost Thermostat.