Yeah, the remans ones all come with core charges... NAPA gave me the best quote for 'em ($58 each) but then the core charge was greater than the price of the part ($68 each). They said I could bring back the old ones after I installed the reman ones, but if I didn't bring them back completely encased in the provided box I would not get the core charge back. Seemed like too much of a hassle.
After some internet research I've found there doesn't seem to be much of a consensus on the best aftermarket CV axles. Might have to take a chance on some of the new ones from Rock Auto and see how they turn out.