The first Tangerine was the Rev C version of the original, January to April 1999, 266MHz processor. The last was the S.E., February to July 2001, 600MHz. That makes a range of about US$50 to $150; later models, higher RAM, and larger capacity HDD making the price difference.
Most bubble
iMacs are worth less, perhaps $30 to $50, but the wild colors, like Tangerine and Flower Power go a bit higher. The creme de la creme is the 700MHz transparent Graphite Summer 2001, 130GB HDD, 1GB RAM. Add a Superdrive and your looking at US$300, sitting on a mahogany desk alongside a Ries wooden tripod with a view camera.