There was only a 106 Mclaren F1's built between 1992 and 1998. There is a yellow one for sale. About $5 million ought to do it.
Rare McLaren F1 for sale with zero miles on the odometer: Update | Motoramic - Yahoo! Autos
There was a blue Mclaren like the OP saw at my last trackday. He was running in group 2 that day.