Thanks for the repost, Kharma.

I think I understand this page now, but it's a little confusing:

http://www.wgp.com.pl/index.php?id_s=205&id_j=en

At the top of this page there are copies of Optimal Nutrition and Homo Optimus, apparently in English, for $30 and $48. Further down, the Polish versions are shown for $20 and $24, but the descriptions say "Available in English." I guess that means, "Look at the top of the page where you'll find the English versions" but that wasn't obvious at first.

When I have the money and the time to read, I'll probably order Optimal Nutrition.