if you are a "set guy", their is no better site then sportlots.com
I have done baseball, from 1982 to 1973 and football from 1981 to 1968 & 1959, using that site.
Completely free to get set up.
It is so easy. Just go thru pick your cards, and if you have cards from 1 seller to 20 sellers, it doesnt matter, they handle the payment dispersal.
Just for your knowledge, I have a few sellers that I have bought from, that are heads and tails over the top, better then others. I have bought hundreds of cards from these guys and have NEVER been disappointed with the card/s
SetMaker
Frankves
JWestport
Jet
DCottons
rtg74rtg
let me know if you need any help. Lord knows I spend most of my days on there