Those prices on the Yukon "cheap" stuff is pretty close to what I payed. I bought through a local shop and that made for free shiping plus IMO it is the right thing to do supporting your local shops.
Add up those Yukon prices and then throw in a set of Spicer Life Ujoints and you have pretty close to 750$ wich is about what it cost me.
That link looks like some nice shafts. Those drive flanges aren't bad either, good price.