ISBN

[user48675]

Is it better to purchase your own ISBN when self publishing and if so, is it best to purchase a batch of them (10). I believe you need more than one - i.e. one for paper copy and one for e-book etc?

'Better' depends on your circumstances and intentions, OP. If you intend to use a third party to help publish and don't think you'll publish more than one book then it might be better not to buy ISBNs yourself given the unit cost. If you do want to buy them yourself then you'll see the unit cost decreases radically the more you buy and as you've said, you need one for each format (ebook, hardback, paperback).

www.nielsenisbnstore.com/Home/Isbn