What a string of bad luck. The only silver lining is that the tup wasn't in the trailer when the wheel snapped
A new small trailer, suitable for pigs or sheep, unbraked (if you are happy with that) is about £1400-ish, I think. We had brakes put on ours so we could carry 1T of feed in it, cost an extra few hundred pounds.
I'm sure others will be along soon to tell you where you'd find a good secondhand one, if that's what you're after.