I very stupidly paid over forty quid for a pleather bag which i mistook for leather and then sold it on ebay for a small sum. I would spend some of the money in charity shops where i have had some lovely bargains including att lovely 70Ks bag. Wasnt leather but lovely all the same. Good as new in fact i dont think it was even used.
I always buy synthetic bags as I'm a vegetarian and I find that because they are cheaply made it is hard to find anything that lasts more than a season. I would really like to find a nice, weighty, well made bag with good quality fittings that doesn't fall to pieces, and I'd play as much for that as a decent quality leather one. A very cheap leather bag is likely to be made of asian leather - the animal whose skin it is may not have been treated kindly.
Cheap leather is quite often from India where welfare standards are not high- I can't suggest a brand as I don't buy leather myself, but perhpas the individual makes would tell you where they get it from.