This can be film related . . .
The Amazon bar code thing is like riding a wild bronco sometimes. It depends on the product. It can be very expensive to set up an special seller account to create bar codes OR it can be as easy as pie if one already exists for the product. And everywhere in between.
That said, old records? Why is Amazon asking for a bar code? If you find the item listed on Amazon already, you need not even know the bar code info to sell it.