The website for the Winter Kart Show is aptly named: winterkartshow.com. The website is not exactly “comprehensive”, but you get the idea.
The show has a swap portion and a new portion. Some folks are there to just display, some to sell, and some both.
KartLift Kart Stands
DeepSeat Kart Seats
877-777-8020
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Don't bother PMing me, it doesn't work. Email is best: tim@kartlift.com.