Cows are the most inefficient animal to raise though, since they require so much feed/land/water... more than any other livestock I believe. If someone made a pigskin/ostrich/emu leather saddle, that'd be cool and more enviro friendly since they don't require the resources a cow does.

I have one leather saddle (Arione) and the rest are just cheap take-offs I got from the shop I work at, so you might try the local shops to see if any have a "take-off" bin of saddles. I've picked up some Fizik Pave's for around $20 in the past, and have a WTB-esque Specialized saddle I got for $10 thats pretty darn comfortable and vegan.