I purchased a scale from amazon.com last week. I read lots of reviews and for the price I couldn't resist. I've been using it for a week now and its spot on with what the Dr's scale said. Nothing fancy but has worked great for me so far...here's the link for it.
Amazon.com: Eatsmart Precision Plus Digital Bathroom Scale w/ 440 Lb. Capacity, Ultra Wide Platform & Step-on Technology: Health & Personal Care