Recently, I found an eBay seller from France who was blowing out a fairly large and varied collection of paper money from French West Africa. I was able to purchase many, many notes which ranged from 1912 – 1956 with denominations from 5 Francs to 1000 Francs. The early notes included 1920′s issues, such as this fifty franc note from 1926:

French West Africa p9Bb: 50 Francs from 1926

I also bought multiples of the following, with selling them in the future in mind:

French West Africa p40: 100 Francs from 1948

Anyways, I ended up spending a couple of hundred dollars on these notes, and most of them ended up being duplicates. However, although these banknotes are neither rare nor scarce, I would imagine that their availability will go down, as it always does with paper money that is no longer being issued.