I agree...
These chinese gasket kits are ok for the standard flat gaskets,
Hell, in a pinch, I have cut gaskets out of cereal boxes,
but I wouldn't use their valve seals, shaft seals or cam cover gaskets.
So with that in mind,
After you pay for a cheap gasket set, that you can only use half of,
and run around finding the other items,
you would just be better off buying a good kit in the first place.
Too bad some of the so-called Supra shops don't offer a complete set
with a metal head gasket, and good shaft, and valve seals.
Personally, I use Fel-Pro, and have been real happy with them.