Heifer shop (mostly facebook heifer shop)
Steer shop
Sire shop
Donor shop
These pages, for the most part for me being the facebook pages of it do a great job promoting cattle and offer a good place to see cattle selling without having to log on 40 sale sites
Also steerplanet, from experience I saw the creature bull on goddards add on the left side and flushed my best cow to him- got my 2 best calves this fall as a result of steerplanet advertising