I have found these 3 companies that sell telescope mirrors on the low end.
Meridian has a 4.25" F8 mirror for about $32, which would be about $40 with shipping. This also includes a secondary mirror. It would make a decent long tube for a narrow field of view.
A 6" F5 mirror seems to be about $80. This would make a nice wide field scope. including a spider and mirror cell it would run me about $150.
If I want to go larger then I found a 12" F4.5 with secondary for about $399. It would need a mirror cell and a bunch of other stuff. This is a plan for the future.
I think for now the 6" rich field scope makes the most sense.