FYI, I'm just starting to get into this, but I found a really good deal on a few J2ME books. http://www.bookcellaronline.com/
has Learning Wireless Java
and J2ME in a Nutshell
for under $10 each. I got both for about $14 + shipping. Found it via Amazon.com's used books links.
It's a hard to pass up deal for anyone starting out.