Actually, the definitive J2ME SDK is available from java.sun.com. Not all of us use Netbeans, you know! Some of us even do IDE-independent/nondependent work.
J2ME is a bit different from the standard Java, however, often device vendors will provide their own SDKs, complete with some sort of IDE (and/or IDE plugins), custom libraries, and other tools. So it's always a good idea if you're developing for a specific device to check out the developer programs from the manufacturer and the carrier.
An IDE is no substitute for an Intelligent Developer.