I have bought many times from Iron Trap, and they are the best! Great prices, fast shipping and accurate condition. That hoard is in the right hands now.
Re: Preserving ‘patina’
Be careful what you use, because someday, it will get painted, and some of those nasty chemicals can leach through years later. Best at that point to strip to bare metal I guess.
I have a few NOCO brand tenders that are great. Got them for a good deal off Amazon, including a marine version which stays under the hood outside year round. No complaints.