I buy most of my engine rebuilding goodies from Summit ,and I am rather fond of the Fel-pro brand (
www.summitracing.com ) They have kits that contain every gasket you need for a rebuild ,and if your feeling punchy ,they usualy have kits that include new pistons and such too.Be warry of most internet stores.In my own searches for supra stuff , 90% of the stores are the same form with different names and the prices suck.But you can call Summit and there people will make sure you get everything you need. (sometimes the kits come in top end and bottom end sets ) Good luck