Nook Friday book isn't generally available on Friday, sometimes Sat, When should I look for it?
Also, I wanted to download the free book from a past Friday and it's $7.99. ??
Why would last week's (or any previous week's) Free Friday selection still be free?
As to your first question, I think you are asking when the current Free Friday selection is available. On one Friday, the Friday it is subject of the blog at http://www.barnesandnoble.com/nook-blog/ They're rarely free past Saturday, and usually the blog is posted by 8AM or 9AM. The chosen book will be free from that point until it isn't, usually some time on Saturday or Sunday.