Since this is turning into a compendium of antibody databases, I figured I'd add the DSHB, since they have cheaper, and sometimes unique, antibodies that won't show up in any of the commercial albums.

https://dshb.biology.uiowa.edu/

www.exactantigen.com
this is a really easy to search data base

www.antibodyresource.com
hundreds of suppliers

Check also www.hytest.fi, they have very good cardiac markers, infectious, neuroscience and autoimmune disease reagents.

exactantigen has been changed to labome.com, antibodies at labome.com are organized.

That's very good and useful to have antibodies information is available in the online database .
it can be access from every where in the word through the internet ...

Novus is also a good source, www.novusbio.com. They have a good collection of research areas/Abs and I’ve found a few reviews from customers that were helpful to me.

They also have a guarantee on all Abs and an incentive for testing in apps or species even if it's not on their datasheet. Hope this helps!

how about the antibody search engine.

1DegreeBio has a comprehensive listing of antibodies. They have ratings and reviews for antibodies too.

One not mentioned so for is the Bionity antibody search with some very useful filtering options.

Biocompare.com and Labome.com / labome.org are all good search engines, you can always just try google and google images too.