I have two covers and I'm very happy with both:
- For commuting and travel I have an M-Edge Latitude ($35) in black:
http://www.medgestore.com/products/nook-latitude.psp
- For home use I use switch over to the B&N leather Sinclair ($30) in Earth:
http://gifts.barnesandnoble.com/Sinc...?cds2Pid=30261