here's a couple sites i bookmarked in my exploring.
http://www.manufacturersdepot.com/s.nl/sc.2/category.37/.f
http://www.horsepowerfreaks.com/price/Toyota/Solara/Quaife/Drivetrain/Differentials
http://www.manufacturersdepot.com/s.nl/sc.2/category.37/.f
http://www.horsepowerfreaks.com/price/Toyota/Solara/Quaife/Drivetrain/Differentials