APPSOLUTELY!!! LOL!
Many appaloosa sporthorse breeders do frequent the COTH Forums… And, if you love spots, don’t forget about the Danish “Spotted” warmbloods, known as Knabstruppers…
As previously mentioned, those in North America include:
JG Appaloosa Sport Horses and the descendents of Wap’s Spot 2… see the FB page(s) recommended by Georgeanne above…
Rugby Creek Sport Horses… as mentioned above…
Confetti Farms… www.confettifarms.com
Altamont Sport Horses… www.altamontsporthorses.com
Davey Farm Sport Horses… www.daveyfarm.com
Gleann Oighrig LLC (yes, it’s me and my website’s not functional, but I do have spots and spotless ones…)
And, for Knabstruppers, see Altamont Sport Horses (above), myself, Cedar Creek Stables (www.knabstruppers4usa.com), Avalon Equine/Kathy St. Martin (www.avalon-equine.com), or Baroque N Dreams (www.baroque-n-dreams.com)…
Good Luck!!! 
Oh, if you want to see the spotted sport horses in action, depending on where you are, there will be spotted and spotless hides competing at the Spring Dressage I/II Show in Williamston, NC this upcoming weekend!!! :yes: