You probably wont save too much buying one used unless you find a fantastic deal. I bought 3 used ones & by the time I rebuilt them I had more money in each one of them than the target price of the new Horstman. But Good luck anyway. You might try the “Wanted to buy” section of the classified.
weirdly enough, the main reason i went with specifically the SMC is because i found a set of springs and weights for it wehad in our attic a looong time ago, so i just went with that haha. but I did end up finding one but thank you for the offer anyhow!