I got lucky last year. Had to go to Keswick to look at the sled I wanted and found a trailer 3 blocks away from it.
I'm sure something will come along. I need one for the winter anyway. I can always borrow one, but I dont like asking.
Don't let having or not having a trailer deter a good purchase.
I don't have a trailer for the dirt bike.
I rent a 4'x9' full size tire equipped motorcycle trailer with folding ramp from U-Haul for $17.00 for 24 hours.
I did the math, that is a lot of trips to the track with 0 maintenance to worry about or having it in my driveway.
Point being - you can rent something if you need to go and pick up something that works for you