Keep in mind that Goodwill stores are locally owned and operated, so each "company" has it's own rules. My wife works at one of the Goodwill stores operated by Goodwill of the Finger Lakes (Rochester, NY). Their rule for employee purchases is that the employee can not purchase any items with the current weeks color tag. Once the color changes (Saturday morning), they can purchase it and get a 15% discount. Now, what some employees do is hold an item until late Friday, price it and put it on the floor just before closing on Friday, then go in first thing on Saturday and purchase the item. They just can't be caught doing it or they will be fired. As far as family members go, we can purchase anything anytime, although the last time I was in and the store manager saw me, she asked my wife why I was there and what I was buying. I'm still not sure what that was all about.
Scott