Some say that this one company is the maker for Toyota Gaskets, but then I also read that someone compared the Toyota gaskets to the Ishipro (or whatever their name is) and found them to be quite different with the Toyota ones looking of higher quality.
Some gaskets you would want to use with sealer, so there is no big deal, but other gaskets like cam seals, front & rear main oil seals, valve stem seals are where I would be extra careful.
The cheapest place to order Toyota parts is from
www.toyotaworld.com
That is Champion Toyota's website.
A complete turbo engine rebuild gasket kit is about $310 USD, last I checked.