I just piece together what I need at mscdirect.com
You don't need a full index, you could probably jump thru the 1/16ths and do 99% of jobs. Say, 3/16, 1/4, 5/16, 3/8. If you get into 7/16 or 1/2 you're chasing some pretty large fasteners that may not be a parking-lot job. Get some 1/8 if it...