Wrong gunshow for you. Being a non KY resident best case you could only buy a long-gun across state lines, most of the dealers there will be non KY state dealers so they can not sell guns at all, just take orders. It's not a reloading gun show, it's a show for buying cases and cases of machinegun ammo. Not reloading supplies. It is a NFA show, so if you are looking to see silenced Rugers, fully automatics, etc, not semi auto AR15s that are a good deal.
You could possibly find a guy in the crowd selling an AR15 rifle of some type privatly, willing to do an off paper sale. Not likely, but to buy the rifle you want from a dealer you would have to find a KY dealer who had what you wanted. Plus why would this dealer sell to you cheap when the attendance at this show will be close to 15,000 no reason to discount guns, everything they bring will sell.