Hi Leon
When I was looking at ball heads, I had a look at
Really Right Stuff and
Kirk which are both made in the USA and they were quite expensive, around the US $400 mark.
The Photo Clam brand in Kerrie’s link are not as expensive and when I had a browse around the web, they seemed to get quite good write ups. There are some posts on various Forums that bash these non-USA products, listing cheap (low quality) Asian copies as the reason, although those who have purchased and used them do seem satisfied with the performance they deliver at that lower price.
Cheers
Dennis