From tomorrow onwards Breyer are going to be pre-selling the BreyerFest swag through their website.
This is open to everyone, so you don't need a BF ticket to buy the items. I'm definitely going to be grabbing myself a t-shirt or something, although I may leave it until actual BreyerFest to do so!
You can find out more here: https://www.breyerhorses.com/blogs/breyerfest-blog/fling-shop-swag
Here are some of the t-shirt designs: