There's not a online catalogue for the selling birds. The catalogue is for the showing section, and will only be available at the show, but anyone who is listed as an exhibitor has their name and contact details in the catalogue, so it's really useful.
If you are looking to buy its better to go on Saturday, otherwise stuff might have been sold already! Some additional selling pens does come in on Sunday, but not as much as Saturday.
Mays, looking for some Hamburg's as I am down to only 1 hen and the cockerel.
Beth