Computer subwoofer and wireless speakers range $25-$30 at Best Buy, Fry's, etc. Great sound, low cost if you don't need it to be portable. Just plug the iPod into the subwoofer.
I'll second the recommendation, I've loved the four issues that have been released. If you can't find the issues locally, there's a good chance they'll be collected in a graphic novel after they've all been released, and that you'll be able to order from Amazon.
You may want to call EB before you spend the dough and time on getting these games for trade-in. My local stores have gotten very picky when it comes to the "exclusions" fine print in their deals. Everyone should be aware that there are more exclusions than exceptions when it comes to trading in...
Who did you trade with? lanselius
What did you get? F-Zero GX and Contra: Shattered Soldier
What did you give? Radiant Silvergun (no case) and Shining Force 3 (disk only)
How long did the deal take? 4 days
Were they friendly? yes
Easy to work with? very
Quick to respond? super fast response time...
Who did you trade with? SS4Brolly
What did you get? $20
What did you give? Tactics Ogra Advance
How long did the deal take? 5 days
Were they friendly? yes, assuredly
Easy to work with? totally
Quick to respond? yup
Would you deal with them again? of course
Shipping Method Used? priority w/...