I have done a search on here but nothing came up.
The price seems fair for a low mile TT Aerotop. You need more clarification about the mileage as it is a little unclear & why were the rear lights replaced? Rear end shunt?
As far as Im aware they are an unknown trader and in my eyes this makes them an unknown quantity. If you decide to look at it make sure the pedals, hand break, gear stick & seat bolsters look like they belong to a car of that mileage.
Also read, print out & take the "What to check when buying a Supra" PDF found in the technical section with you for help, link below.
http://www.mkivsupra.net/vbb/showthread.php?t=67644
In all honesty if you are looking to spend that on a TT look in the classifieds section on here. There are plenty of nice TT's available, with the added bonus of being known within the club and having a good service history.
Other option is contact Jurgen(http://WWW.JM-IMPORTS.CO.UK) He is a well known, trusted & respected importer of the Supra, see what he can find for you.
HTH