The Apple store is always the best bet for IPod accessories as they are the ones who make the IPod and would make accessories tailored to its specifications. You can probably find accessories that would work for your IPhone from other manufacturers, however, they would probably not be of the same quality.
There are several accessories that are available for use with the Apple iPod. There are protective cases and sleeves, as well as holders and decorative accessories for the iPod.
I would look at the Apple site. They have all sorts of accessories you can buy.
You can find Apple iPod car accessories at the place you purchased your iPod, an Apple store, Best Buy, Amazon, or Wal-Mart. You can usually find car accessories at many places that sell electronics.
You can look online to find cheap iPod accessories with free shipping. The different accessories available are iPod cases, cables for cars, docking stations and headphones. These are all items that are needed and can be used with any iPod. The free shipping will make it worth your while to shop online and find these iPod accessories.
You can find all kinds of iPod accessories at http://www.lightinthebox.com/c/ipod-accessories_284. They sell various accessories for iPod. Another place to check is http://www.accessorygeeks.com/apple-ipod-nano-5-accessories.html.
You can find cheap iPod accessories at stores like Target, Wal-Mart, and Best Buy. You can get them online at the store sites or you can get them directly from Apple.
Yes, I would get the iHome or other dock accessories. This will allow you to play your iPod at home.
You can find 3rd generation iPod touch accessories on the Apple website, at www.apple.com. There you will be able to find protective cases, headphones, car chargers, and more for your 3rd generation iPod touch.
The best place to get accessories of any type for the iPod is the Apple store. You can also find both official and generic accessories at shopping sites like Amazon.com.
I don't know of any that are specifically for the helmet, but there are some great accessories for iPod shuffle that are straps that use Velcro. You can use the strap to attach it to your arm, or perhaps a helmet. I would check Amazon.com, which will have the strap accessories both new and used.
You should just be able to go to the apple store online and you can find all iPod accessories on there. Whether it's UK, AUS, USA, anywhere that your iPod was made.