The Ilsa collection are a few of the best grindhouse films out there. If you have a chance to pick up the box set, then please do so. I would, but I can't find it for a reasonable price. Highly recommended.
It is impossible (or has been in my searches) to locate the Ilsa Box Set. You are better off just getting the three seperate movies (which are easy to find and the only things which make up the box set).