Hi pbleed,
1. I presume that you are inquiring about historical antiques and not modern machetes.
2. They generally were more like short swords than what we would these days call a machete.
3. The Spanish army used large numbers of these and the only place that I have seen them turn up for sale are at this Spanish antique dealers website:
http://www.armasantiguas.com/
Unfortunately, it is all in Spanish, but I have bought arms from this firm and they are very good to deal with.
Cheers
Chris