Big Brown's auction prices of $60,000 as a yearling and $190,000 as a 2-year-old in training weren't high enough to attract much attention when other horses were bringing millions of dollars. But the amounts did stand out among the progeny of the stallion Boundary in their respective years.
According to The Blood-Horse Auctions of 2006 supplement, Big Brown was the highest-priced Boundary yearling sold in North American by far that year. Twelve offspring of the stallion were offered, and seven were sold. The lowest-priced brought $3,000. The second-highest-priced sold for $30,000. Boundary's stud fee in 2004, when those yearlings were conceived, was $10,000.
The Blood-Horse Auctions of 2007 supplement lists five Boundary 2-year-olds that were offered at public auction that year. Four were sold, and Boundary's price ranked second, behind the $200,000 for a filly out of Aces (by Housebuster) that was later named Junior's Aces. Purchased by Southern Equine Stables from Kirkwood Stables, agent, at the Keeneland April juvenile auction, the filly has not raced.
Big Brown was sold at the 2006 Fasig-Tipton Kentucky October yearling auction and the 2007 Keeneland April auction.