I think that Quaterback is consistently producing some foals with some pretty hefty price tags as weanlings/yearlings, I've seen around $12000-$25000 for them. Can't say about 3 year olds yet though. I think Judy Yancey had him this year for around $900-$1000 per dose.
Sandro hit foals (especially colts) are, depending on the mareline/breed, all around 8 000$ (cross bred or not european registered mares, tb dams) and.... well.... 6 digits prices ?? (mostly in Germany, at foals auctions)
3yo tends to be (in America) all between 30K to 200k, with a minimum of training/showing (gueldings and unproven/unlicenced stallions)...
Well, these are my personnal observations as I did alot of researches recently in order to put a decent yet buyer-attractive price tag on my 3yo Sandro Hit when I'll start to market him later this year.