In most states you can get muzzle loaders shipped to your door.
Look at Buds Gun Shop, you may also want a pistol or revolver too!
https://www.budsgunshop.com/catalog/index.php/cPath/2084_803_1783/Black+Powder+Rifles/
https://www.budsgunshop.com/catalog/index.php/cPath/2084_803_1784/Black+Powder+Pistols/
I don't have a preference as to side-lock, in-line, pistol, revolver or even the bullet or powder type. So I'm no help.
Depending on your interest, there is a tremendous amount of diverse loading and shooting capabilities available.
This is some of the components list for the stuff I use in my revolver, pistol, in-line or traditional muzzle loaders. Hell, I even cast my own projectiles.
Goex, Pyrodex RS and P, even Blackhorn 209 powders.
#10, #11, Musket percussion caps, 209 primers.
Cast 44cal round balls, 50cal conical bullets, 50cal sabots for use with 44cal or 45cal projectiles.