Jr 821,

72 oz on 4.8 and 80 something on 6 volt

retails for about 30$ but you can find them on ebay for much cheaper

They generally wont go for that much, here is 4 servos http://cgi.ebay.com/Spektrum-DS821-D...ayphotohosting

id expect these (assuming a biding war doesn't start) to fetch 50-60$

Steven