That all depends how long you have timewise to do the cold filtering.
You are going to lose 1/2 the capacity (HP) to get the glycol cold enough for the filtration.
I have never sold a chiller less that 3 HP for cold filtering, but realistically even if you took a large amount of coil inside a large freezer, I bet it would cost you thousands just for the metal.
I have some smaller units coming out over the winter, but I doubt any would be much less than $3 or 4K.
I can get a 115/1/60 small chiller out of Buffalo, but that is over $4K.
If I find anything smaller, I'll post it.