Hi hb, best to make one yourself to get what you want. Or as you mentioned, find something you can use. Audacity to best of my knowledge has no engine for building its or your own progressions.
Just record the progression you would like and have at it, or you could ask someone here to make you one that you could use.
Also there are some programs on the net that will allow you to make your own....heres one that I just found and is simple,sounds good and has a variety of bass, drums, guitar and piano...you choose what you want, set the tempo and play along, or use a recording app to save it.
JamStudio.com - The online music factory - Jam, remix, arrange chords and loops - free guitar
Hope this helps...........................Kenny
Note: Hope to hear something from you soon Carol......you too hb