I usually look for my machine makers and look at gadgets and buy bobbins for my machines or other feet etc.no local dealer in area so try to cover a wide range of what might go wrong.
i like to buy on the last day fabric in large amount for backing. Usually get. Discounts as stall holders don't want to take them back.
i have purchased a new sewing machine which had been the one people were trying at the show.lovely machine.