Last month, I got a refurbished Nook wi/fi (not the color one) for $100.00 on ebay with the year's warrenty. I LOVE it...
I didn't feel I needed the 3G because I download the books on the wi/fi at home or elsewhere, or sideload them on the mac.
You can get the internet with the wi/fi, but to be honest, it's slow and kind of hard to get used to...I just use it for my books.
Also I signed up for the Free Philadelphia Library ($15.00 / year for non-Philly residents) and so far have made great use of it.
Good luck with your purchase.
