RSLogix Micro Starter is the least expensive option for you. RSlogix Micro Developer includes basically the same features as RSLogix 500 Standard but only works with Micrologix PLCs. The Starter version doesn't do online editing, cross reference, and a handful of other handy features, but can still get online and save files. There is a "Starter Lite" version that is free but will only work with Micrologix 1000 and Micrologix 1100 PLCs.
RSLogix Micro Starter 9324-RLM0100ENE $151
RSLogix Micro Developer 9324-RLM0800ENE $540