According to the place where I got my pictures, the unlimited black lotus is worth $1200 and the beta is $2500, a'course that's undoubtedly mint condition. It's also what this other site says.
Unlimited: http://www.brainburst.com/db/search_result_card.asp?id=8989
Beta: http://www.brainburst.com/db/search_result_card.asp?id=8687
Other site: http://www.starcitygames.com/cardsearch.ph...h=Black%20Lotus
How come you're quoting so much lower?