We just bought RSLogix Micro Developer for a customer who only has Micrologix 1100 and 1400 controllers at his plant.
I believe we paid < $550 for it.
Sidenote: I had already installed RSLogix 500 on his machine thinking that I need only add the license once purchased. As it turned out, Micro Developer is an entirely different software package that looks and feels exactly like RSLogix 500, so I had to download Micro Developer to his machine, then during the installation, it required the uninstallation of RSLogix. Not a big deal really, just a little time consuming and surprising to me.