I personally have had good experiences with Coleman stoves, but if you're looking for other options try Meco Lock N Gos, found at Wal-Mart retailers. If you would like more information on different portable grill options, bbq.about.com has an article on the top ten choices on the market.
Yes, there are always cheap portable grills for sale. Aldi's always have cheap portable grills for sale and so does family dollar. They have those grills for $20.00 and under.
No, electric barbecues do not have to be plugged in - they are constructed to be portable in many cases and if you look at the pictures you'll never see a plug in sight.
FireMagic sells grills & barbecues, burners and the accessories that come with it. They have gas, electric or charcoal grills and barbecues. They have portable or cart grills. Accessories include vent hoods, grill covers, griddles, woks, pots, tongs, brushes and cleaning materials.
Butane
http://www.pkgrills.com/ has one type of grill for sale, but it is portable. Many department stores have them (Sears, for example), and Wal-Mart has many affordable portable grills.
It includes establishments making electric grills
Portable grills are great for people with limited space. Small yards and apartment living are ideal for portable grilling since you don't have space for a full-size, permanent grill. The best thing about portable grills is that you can move then from place to place. The beach, friends' houses, and tailgate parties, to name just a few events, are ideal grilling opportunities. Portable charcoal grills require few supplies and little setup and burn hotter than gas grills.
A good site for finding answers about electric grills is the site "Life 123". At this site you will find articles, videos and other information pertaining to electric grills.
Take the party with you! A portable grill is great for the home, but is also awesome to take to a friend's house, to the park, or to tailgate with. Portable grills take up little space and can be set up and torn down very quickly. They are perfect for camping trips or lakeside adventures. Plus, portable grills are generally much less expensive than stationary grills that just sit on the back porch and rust. Remember, food on the grill is always better.
Propane grills are typically cheaper upfront but cost more to operate in the long run compared to electric grills. Electric grills are more energy-efficient and have a lower environmental impact since they don't emit greenhouse gases like propane grills do.
A portable barbecue grill is portable - meaning, not stationary - and can easily be moved around from one location to another and is used for outdoor cooking. Additionally, modern portable grills have been designed to be collapsible for convenient transportation. Many people use portable grills for camping, picnics, tailgating and other outdoor parties.
Online shopping for Weber--choose from a huge selection of Weber charcoal grills ... portable grills, propane grills, barbecue accessories, barbecue tools