Adi, it might help if you tell us what you need the skins for.
Bookbinding ones, or calligraphy ones are *very* carefully selected and will cost a fortune.
Split skins for gardening gloves can be bought very cheaply however (£5 or £8 each last time I bought some, but I got some kidskin ones with the hair still on for £3 from an East European Viking re-enactor). Drum skins are different again.
It's a horses for courses sort of thing, and they all come from different suppliers. They are all of good quality, for their intended *use*, but not so good for other purposes, and the different tanning processes alter the finished skins too.
Cheers,
Toddy