My method is to buy good young fillies, BLUP them, and use them for breeding.

Usually, you can tell these apart because they have someone else's affix.

Besides these, the only horses I have that I didn't breed are my starters, my divines, and two stallions I got as presents (Kurt, chestnut German Saddle Horse, and Flame, palomino Thoroughbred).

None of these horses are for sale.

I don't put my horses up for sale, but, if you're interested in a horse I bred, PM me and we'll work something out.

Also, if you want to reserve a box in my EC, PM me.  I don't know when they'll be empty, but I'll try.