I need to find the most powerful (sites, search engines, pay sites,
databases) to find the most complete source of art supplies (objects,
materials, tools, etc).

What I really want to consider my question answered:
 - A list 6 or more of the most usefull tools to handle such queries.
 - that the tools must allow someone to find and object, tool or
material with it's dimension, price, availability and delivery time
(including Canada)
 - A "proof" or a mesure of their completeness or a mesure of their
superiority. Basically I don't want just an opinion of someone saying
that they are the best tools... unless of course this opinion is
backed up by some credibility, the person is an authority in the field
or it is found on a website that is impartial in it's analysis.
Basically if a site is proclaming itself as being the best... it's
worthless to me.

Please don't include Froogle as part of the answer as I already know
about Froogle.
 
 
Thank you.