About 70% of the new / retail price which is reasonable.
Google the official Takahashi System Charts for your scope to determine how these fit, and with what adapters etc.
Pictures are here:
http://db.tt/PVRoYUCu
Takahashi Sky90 Focal Reducer / Field Flattener
AEC price - $430.00 Sell for - $300.00 (or best offer)
Takahashi Camera Angle Adjuster, for FS60 and Sky90 (among other scopes), lets you rotate the camera or diagonal without losing focus, essential for CCD work where you want to re-position the object without undoing the thumb screws!
AEC price - $235.00 Sell for - $165.00 (or best offer)
PMs only thanks. Buyer to pay shipping and insurance. Firm.