I think the more uncommon the combination the higher of a premium it brings. I've been passing on fair priced 22/410's for a few years now hoping a 357 mag or a 357 maximum might fall onto my doorstep someday but today wasn't the day, maybe tomorrow.
I see the 30-30's sell at around $500 at most of the dealers shops but they're dealers and gotta make a profit above what they paid for it so anywhere around $400 for it on a private sale would be pretty good. I can remember only a few years ago you could grab up a 24 in 22/410 for $200, not anymore, seems like a combo frenzy occurred.