There is no minimum fee for a transfer. Whatever the FFL holder wants to charge is their decision. I don’t charge veterans or teachers for a transfer. Cabelas in Kearney, Nebraska was charging $25 per firearm even though the “work” is the same for one firearm to a buyer as it is for three or four as long as there aren’t two or more handguns involved in the same transfer. There is one exception to this. If two or more handguns are transferred within five business days then another form has to be filed by the license holder. Copies of that form go to the ATF, the county law enforcement chief (which is usually the sheriff) and the original stays with the FFL holder.