Last I saw, Dunlap had a considerable quantity... They are nice folks and will be happy to help you out. You might have to talk loud on the phone if they have any machines running at the time.
Rant on/
All the ramrods I've seen in recent history, regardless of supplier, have been below the grade that I'd consider acceptible for a real ramrod. I've resigned myself to either making them completely from scratch from the right type(s) of Hickory, or else getting oversized ramrods. With oversized, you can take the wood down following the grain, then straighten with heat. I wish there was a simpler answer. It's not rocket science to start with a quarter split section of nice straight Pignut or other high density Hickory and split and saw it out to follow the grain with a froe and a bandsaw. Straighten the sticks afterwards with heat or steam as required, then reduce to round. I used to make traditional bows and this isn't a hard task just a bit time consuming. Personally I'd pay well for PROPER ramrod stock. What I've seen is various species of Hickory and Pecan and other similar woods sawn out irrespective of grain orientation. IMHO if it won't work for an arrow shaft it won't work for a ramrod. I expect a ramrod to be usable, not to be just a decoration hanging off the bottom of the gun!
https://www.wood-database.com/?s=pignut+hickory I prefer the denser stronger end of the hickory species. Look at the density and strength numbers and pick your poison!
Sorry, this is one of my pet peeves.
Gerald