Here you'll find links to hardware from a variety of retailers of mobile music (and regular music) hardware. You'll also find links to stuff on eBay which you can't buy new anymore.
iPhones and iPod Touches:
The obvious thing to do if you want an iPhone or iPod Touch is to go to Apple, but sometimes if you don't need the most up to date device you could try getting a 2nd hand Touch on eBay, or try Amazon for slightly cheaper deals. Here are some links to help:
For the iPad the story is basically the same, so again a couple of links to help you find the best deal for what you need.
eBay:I regularly post stuff on the blog that comes up on eBay but here are a few things you might be interested in if you want to get into older platforms for handheld music.
- Palm PDAs - Palm OS Tungsten T3's at eBay / Palm OS PDAs at eBay
- Windows Mobile - Dell Axim at eBay (you want an X51 or X51v ideally for music)
- Android Hardware - I haven't included any links as yet for Android as I'm still not sure what works best, although the Dell Streak looks quite good
Line6 MIDI Mobilizer
General Music Hardware links:
If you're looking for stuff like the iRig or AmpKit try eBay as you can get decent deals on stuff like that there. If not try one of the following retailers.
Dolphin Music Always a good place to find hardware for your mobile rig. Dolphin
Absolutemusic Another good store to find music hardware
zZounds.com also has a good selection of stuff
Music123.com is worth checking out if you're in the states
MusiciansFriend.com! Last but not least
Can't find what you want? If you think there's a category missing then why not suggest it by emailing email@example.com.
If all else fails why not try out some Palm Sounds merchandise here.