The last tube I had installed last year was right near $700. $330 for the tube, $300 contour, chamber and install, $50 shipping, ect… That’s for stainless. I chromoly tube could be cheaper in the white, but then you’d need it blued.
Like others have said, that’s pretty well a new gun.
You’d probably be better served to try something like this and if the gun likes it, buy a case and get your girl out practicing.
Quantity: 20 Round
cabelas.store
Pac-Nor would be an outfit to call if you decide on a barrel swap.