Mostly, it depends what you're prepared to pay
I usually find that the things that I really want, other people with deeper pockets want too
Breeds that do well at the Dingwall show include RIR, Cream legbar, show quality Australorps and game birds, anything that lays a dark egg, Light Sussex and Scots Dumpies. recently it's been more of a buyer's market though, so there are bargains to be had. Just make sure you've inspected the pen and you're happy with the health of the birds. And don't bid against me, please