There may be hamsters for rehoming, (I don't have any "spare" at the moment), but that depends on who has animals available, (which I don't know).
Since, like most exhibitors, we breed only because we show, hamsters for rehoming are the "spares" from exhibition litters when folk have kept what they need. As such, the numbers, colours etc on offer vary from show to show. If you want to buy a hamster from the Sales Table, I would recommend getting there about 1000, as they can shift pretty quickly!