Which parts, specifically? If you're getting headgaskets, just buy the Toyota ones. They're still available. Don't cheap out on a job like this.

 

Yes, agree with LKA; don't cheap out on structural parts. Everytime I cheaped out, I had to do it all over again in 18 months. Cheap sourced parts are OK for trim or tail-light lens replacements.
Key point, If one has to spend lots of labor to replace the part, go OEM qualty level.