HP Officejet Pro -I will dispose of (Marin)

I am hoping someone out there has an old HP printer that they are waiting to junk. The print head I need is for one of the these models HP 7720 7730 7740 8210 8216 8710 8720 8725 8730 8740
I will salvage parts I can use and dispose of the rest for you. I am mostly in need of a printhead, but might need other parts. I specifically am repairing my HP Officejet Pro 8720 All in One