Patched round balls are certainly cheap. And if you are a real scrooge you can miserly cast your own. Cheaper yet.
And if you're ultra cheapskate, you can crawl around on your knees in the parking lot. Popping wheel weights off of people's cars and use that to cast with.
I think people overs think muzzle loaders more than any other firearm. Maybe because they're so on familiar with them.
Scope? You don't need a scope on a muzzleloader. Pinch those pennies and use them to buy more (real) black powder.
You never know. You might find this is a lot more fun than you thought and your 7-08 can go down the road to someone else who has yet to see the light.
In the early '70s I still lived in Colorado, and a friend of mine there got me started shooting muzzleloaders. They were something new to me and were fun to shoot. My first muzleloader was a percussion .45 caliber Kentucky rifle that I built from a CVA kit.
Since I was already casting wheel weight lead bullets for my .357 and .45 acp pistols, I also started casting round balls for my muzzleloader. Wheel weight lead contains Antimony and make great centerfire pistol bullets, but they are too hard to expand well at the slower muzzleloader velocities.
Also in the early '70s, Colorado started their first modern muzzleloader deer and elk seasons. I used my .45 Kentucky with a patched round ball back then to shoot my best mule deer.
Colorado then changed their rules and required a minimum of .50 caliber for muzzleloader elk. I then bought a .54 caliber Hawken rifle from a Green River kit, but I left Colorado before I could use it there, but I did use it here in Montana shooting a 435 gr lead TC Maxi Hunter bullet to shoot a Buffalo.
While I was on my muzzzleloader kick I also bought two single action army BP revolvers, one in .36 caliber and the other a .44 caliber, and I built a single shot .45 cal percussion pistol from another kit.
And, because Montana does have some BP or shotgun hunting areas, I bought a Traditions in-line .50 cal BP rifle with a scope. I've only used it once, on a friend's farm in Illinois, but it has yet to draw blood.
I have also expanded my bullet casting to include round ball or conical bullet molds for all of my BP guns.
Back to the OP's original question, I've always gone (I think) the cheap route and have handloaded for all of my firearms to the point that I even make my own shotshell shot. The initial cost of the tools can be a little high, but I make it up with a lower cost per shell and I get to shoot much more.
