where can i find a manual

i m a auto mechanic from the city of San Fernando CA, "TOM'S AUTOMOTIVE" running a shop with my father is great but taking the job on my own and starting a mobile mechanic service of the shop is great. but can and does have its challenges, especially wen it comes to simple information i am used to looking up on "ALLDATA" its i just so expensive to afford and i do not necessarily want to carry a grip of shop manuals books, so i would like to find on the web exactly where can i find free car/truck repair service manual. information is so hard to come by on the internet that is actually worth reading.