Well - I've bought great jazz necks from Ebay new (chinese) for as low as 35-40 $ delivered. Just need to level the frets and they are good to go. All the measurements have been accurate to the add so far.
I tend to change the nut to a bone nut too. Costs extra 1$... Too bad the unfinished paddle necks are hard to get for bass. You get a finished one for 40$ and pay 100-150 for unfinished one... 🤔