I have this one I found it at my local Wallgreens Phamacy for the same price as my link below. Runs on 4 AAA batteries or they have an AC adapter. The sound is pretty good for 30 bucks I can't complain. And the batteries last about 6-8 hours. You can order it here too http://www.smalldog.com/product/34034
Basically you can get any iPod dock with speakers, as nearly all support the iPod mini as well.
I'd check on in the review section here, or on ilounge.com for recommendations to suit your budget.
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