I purchased mine at www.werkplaatshandboeken.tk , their site is in dutch language , they will reply in english.
Repair manuals;
-IS300 1999-2005
-GS300 1991-1997
-LS400 1998-2000
-RX300 2000-2003.
Price is about 20 dollars.
I hope it will help you.
Specialized in LEXUS repair manuals!