For Lame MP3 there are other free alternatives to Audacity, like Lame Front End .. just sayin' (in case you NEED to get MP3 right away).
I've used it for years. IMO it's best to get the app from the original source -
http://www.pazera-software.com/products/lame-front-end/

As with any download, always be careful, though I've never had an issue with pazera nor heard of any..
Obviously; avoid the decoy ad at top of page though ..
It also has a Batch mode which is nice. It's a simple GUI for LAME and very fast/efficient.
Offers 'Expert' (advanced) LAME options also.


I do not work here, but the benefits are still awesome
Make your sound your own!