usually from ONLINE toyota dealers.
they aint like stuff you'd find on amazon.
one cool thing is toyota has a tech info online where you can download PDF files of the manuals. but there are TONS of individual files to download.,
you pay like $20 for like a 2-3 day subscription fees.
these are mainly for repair shops where they maintain a yearly subscriptions.
funny story. when i got my subaru STi, a bulletin board started a project that wrote a script to download the whole PDF files.
it ended like over 150 separate files...
http://techinfo.toyota.com/
for my set, i bought it from a texas toyota dealer. ended up like over $200.
well worth it. came in 5 volumes.