Yep! It could be all yours if you go to this site:
http://www.bonhams.com/auctions/19801/lot/156/ and this one as well for the car!
http://www.bonhams.com/auctions/19801/lot/163/ .
The auctions will be take place at The Sarah Jane adventures at Bonhmas Auction house, Knightsbride on 12 Dec 2012 at 12:00 at noon. Various costumes are included but perhaps the most interesting, and saddest, is the car used by Sarah Jane in the series. ( Thanks to the quote: doctorwhosite.com)
You will see all the items on-line at
http://www.bonhams.com/search/?q=Sarah%20Jane%20Adventures&indexes=lot&past_sales=future.
Here's the catalogue of items of the Sarah Jane Adventures:
The Sarah Jane Adventures, 2007 - 2011: Elisabeth Sladen as Sarah Jane Smith Sarah Jane’s car - A 1991 Nissan Figaro Two-Door Targa Coupé,
Sarah Jane’s car - A 1991 Nissan Figaro Two-Door Targa Coupé,
Registration No. - J337 KAE
Chassis No. - FK10017309
Manufactured November 1991. First registered in the UK April 2007
MOT Expired - February 2012
Engine Capacity 1000cc, Right Hand Drive
Automatic Transmission, in ‘emerald green’ coloured bodywork and white/white coloured leather and velour interior
Estimate:
£4,000 - 6,000
This is the second registration to feature in the show, but remained Sarah Jane’s vehicle until the series ended in 2011. (And Thanks again to doctorwhosite.com)
Others included Torchwood and classic Doctor Who as well at the
http://www.bonhams.com/auctions/19801/.