I just purchased a new DX-4 solvent print head from DIGIprint Supplies in Belgium and the price I paid was $522.17 plus shipping FedEx to the USA.
It arrived very well packaged and the head ranking numbers you need to use are printed on the clear plastic cover that holds the print head box together just in case you install the head first without entering the head ranking numbers.
From the day I ordered the print head until the day it arrived was about four day's and it would have come faster but FedEx screwed up the shipping on it.
The hardest part was paying for the print head because each time I entered my credit card number the credit card company denied the sale because any sales outside the USA in their wisdom must be credit card fraud. After a few phone calls and me verifying that it was really me making a purchase they let the sale go through.
My review is I would use them again anytime. Jim Hill