My purchases from Scaleforum included a couple of books - Rail Preservation in Australia and the Gauge O Guild's second book of small layouts. I picked them up mid-afternoon after presumably all the very British 4mm finescale modellers had decided they didn't need them.
At Guildex a few weeks ago, I bought 2mm scale brick Plasticard.
Worse, had Parkside brought the full range to Scaleforum, I was in the market for a couple of 009 wagons.
I really haven't got the hand of this scale specific show thing!