Airguns of Arizona has three TAU 200 Junior's .177 Caliber with Diopter Sights in EX Condition for $250.00 each. New they are over 2x this with peep sights. I talked to them and they came from a defunct club that did not use them.
http://www.airgunsofarizona.com
I have no affiliation but the price seemed right so I thought I would pass it along.
I am almost tempted to pick one up for PCP conversion (mac-1 does these for reasonable).
Charles