Flash, what would you use it for?
You could buy a pistol caliber that exceeds the usefulness of either round. One easily comes to mind a lever in .357, even without rolling your own ammo this is the most versitile. Plink .38s all day and any good .357 for more serious stuff.
If you just want one, save for a good one. The cost of the carbine will not be an issue, just the shells.