The AT&T Wireless site lists a total of 50; prices range from free (11 models, lots of fine print making them less than free in the long run) to $550 (for the Samsung Galaxy Tab). Several models offered at various prices are refurbished. I myself am on Verizon, so I don't presume to make a judgement re AT&T's products/services
Any electronics site or store will carry a wireless mouse that will be adaptable with your computer. Some very good sites that carry wireless mouses are Futureshop.com and staples.com.
There are several stores that carry Wireless surround sound systems, some of which are physical stores and some of which you have to purchase online. Best Buy, Walmart, Amazon, Currys, Logitech, and Vizio carry wireless surround sound systems.
Verizon Wireless
CompUSA is one store that sells at least one model of flat screen LCD TVs. Branches typically carry a number of models that can be viewed at the branch. BestBuy is another retail chain that sells flat screen LCDs.
There are several models of modem supported by AT&T these include the Motorola 2210, Westfell f90, Speedstream 4100 or 5100b. These can be found in many major electronic retail stores such as Best Buy, PC World etc. Online retailers such as Ebuyer, Amazon or auction sites like Ebay will also carry these items.
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Depends on the model, the E/F superhornet models carry much more than the A/B or C/D models did.
Wireless
Alltel wireless has a wide range of cell phone brands that they can offer customers. They carry Motorola, LG, Blackberry, Nokia, HTC, Samsung, Palm and Pantech Curitel.
Home Depot carries a plethora of do it yourself home security systems. One of the most popular models they carry is made by the Mace Company. It ranges in price from $80-$90. The system is fairly easy to set up and can carry up to 14 additional wireless sensors.
The Audio Technica wireless headsets can easily carry into another room, and the battery lasts for over a week, to boot.
Yes, you are able to send free text messages to anyone else using AT&T. If they are not using AT&T, or you do not use AT&T, there will be a charge. If you carry a texting plan, it will be included in that.