On both occasions, the payments were exactly 1/4 of the purchase price.
I was going to do the same with that new resin printer, but look at this: Just as well that I read it, otherwise it would have cost me $589.
When I went to place the order, I therefore clicked pay with PayPal (normal), and the supplier tacked on a 1.5% surcharge

I looked at the other payment options, and found that I could do a bank transfer with no additional costs, so that's what I used.
Just thought I'd point it out.