you CAN find the part at www.napaonline.com
browse the catalog-drive line-enter your vehicle info-ujoints and related stuff-on page 3 or 4 on the bottom you will see 'double cardan (CV) H yoke, item # PUJ647, price is 63.99
the other parts are available there too, centering yoke (for use of 'ball thingy) #PUJ607
if there is a NAPA in your area, call them to see if they have/can order it IF that is the problem.
if where the ujoints fit into the shaft are rounded out due to joints worn out, then a whole shaft would be needed but otherwise parts can be had.
A driveshaft co. should know that, have them SHOW you what is bad so you know for sure what you'd need.