I just recently purchased my first half pad, a sheepskin pad by Cottage Craft. It was $70 (CAD) and is absolutely amazing.
It's not as thick as some of the other sheepskin pads, but the quality of the wool is amazing. It's by far the softest material I've ever felt.
So, if you're in the market for a sheepskin something, Cottage Craft does some amazing stuff. They do half pads, full pads, girth covers, seat savers and more.
Go check them out!