Hi, sun surfer! I was going to recommend to you to jump over here to Sony forum to read some of the posts on discounts. The $50 discount is good through Nov 27th. There is also a trade-in deal that Sony has now. Up to $75 depending on the condition of your ereader. It seems to be applicable to other ereaders and not just Sony models. People have been able to combine the trade-in discount with the $50 sale to get a really good price. But, if you want to keep your Nook while you "test" your Sony purchase, then it might not be a good idea for you. Just something else to consider in your research.
If you go to this link, the Sony website has info on the $50 discount and the trade-in program. Click on Reader Digital Book in the left column.
http://www.sonystyle.com/webapp/wcs/...S_Weekly_Deals