Depending on the type of mp3 player you have you can find the cables for most players at Best Buy, Radio Shack, and often times Wal-Mart. All of these options have online stores and at times will even offer free shipping. Another low cost alternative would be Amazon.
You can buy a firewire 400 to 800 adapter cable from any good computer shop on the high street. You can also go online to eBay and Amazon to buy this item.
Call up your cable company and ask them for an adapter.
You need a antenna cable adapter, you can find out more info here. http://www.tss-radio.com/chrysler-antenna-adapter-p-4067.html
If one wanted to find a single cable that takes HDMI to DVI, there is a cable that does that. It is found at Firefold. Its cost is roughly $3.20 for a three foot cable.
You can find a wall adapter/charger for your Game Boy Advance at many online stores. Three of these include www.amazon.com, www.toysrus.com, and www.bestbuy.com.
An mgg cable is an cable that you use when you need to find personal stuff about you online.
So far according to the reviews I found online, you can find a good quality xbox adapter with a very good deal at best buy store or best buy.com online.
You can watch cable television online at websites such as Cable One. You can find individual shows from cable networks on streaming websites such as Hulu and Netflix.
There are many online shops that sell wireless USB network adapter. Amazon.com is one of online shop that sells wireless USB network adapter with any kind of models. You can visit www.amazon.com
You can get them at the Apple online store, or through Amazon.
use an hdmi cable and you should be able to find an hdmi to dvi adapter for about $30.
You can find a road bike tire pump adapter at most bike shops or online retailers that sell bike accessories.