Ebay
The number 1 auction site. Great for finding vinyl and cd's.

Dustmightz
Dust Mightz beats & sounds.

Star Style Secrets
Find out what's hot & what's not

The-Breaks
The best sample info on the net

Block Rockin' Breaks
Chi-town's radio show Hosted by DJ Red Sonja Old school, breaks, beats,

90's golden era hip hop, Funk & Soul.

Betty's Fast Cheap & Easy
Based out of Chicago, Online record store selling rare collectible Vinyl Records!
Jazz Funk Soul Breaks Beats Hip Hop Blues R&B & More.
Click HERE for Betty's eBay listings.

Sounds Original
1950's &  1960's Collectors Record Shop in London, England. They also sell 70's & 80's vinyl. 
Worth checking out if you're in London or from time to time they sell stuff on ebay. 
Click HERE for their listings.