http://www.dinodirect.com/iPod-Accessories/. the website is really good, from which I usually buy accessories.
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To buy an iPod touch, with a good deal you can go get them at a pawnshop, of refurbished, or on a merchant site like amazon and eBay, all of these places have good prices on iPod touch.
This is a great place for ipod touch case sight. It might just be for the fourth generation
A good website to purchase a IPod Touch 4th generation would be from the Apple site in their refurbished section. Another good place to purchase a cheaper IPod Touch would be on Amazon.
A good place to search for a refurbished iPod touch is the apple site. They're currently offering a 64gb refurbished iPod touch for $249. Purchasing from the apple site, you will also get their standard 1 year warranty with the iPod despite it being refurbished.
Yes there are a lot of inexpensive accessories for your iPod. Amazon.com has a lot of them. I saw some on amazon for under a dollar. Its a good site to check out for the cheaper prices.
Depending on the features of the iPod Touch will let you know what version (or generation) it is, in consultation with apples site
A great place to find an iPod Touch at a discount price is from an auction site like eBay. Other good options are Amazon and Craigslist.
http://ipodtouchtricks.net/ipod-touch-tricks/voip-support-on-ipod-touch-2g-confirmed/ according to this site i guess you can
Although it is not recommended that you do so as it voids warranty. If you do want to open up your iPod Touch 4G for repair or otherwise a good tutorial is found here - portatronics site
Yes there is a new iPod Touch 5th Generation out! You can buy it on apples web-site for $299!
Yes there is a lot of car accessories available for iPod. From Dual jolt and connectors, you can them at this site: http://store.apple.com/us/browse/home/shop_ipod/ipod_accessories/car_audio