The Goodwood site currently has admission tickets for Friday (£55) and Sunday (£78). I'd suggest you snap those up quickly.
The cheapest option still available for Saturday is the "Goodwood Mess" package. A bit pricey at £710 but at least you'll get a good seat and decent food. Or you could just do Friday and Sunday Revival and spend Saturday sightseeing.
Goodwood supports
Twickets for ticket resales, or you could try
Pistonheads.. Both of these offer at face value but I understand there's not much about currently.
Good luck.
~iw
