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Midway has Savage barrels in 35 Whelen for $149.99. You can have a gunsmith swap it for the old barrel. If you're a do-it-yourself kind of guy, you can buy the rebarrel kit for $174.99. Midway will give you tech support and advice to perform the barrel swap safely, but it wouldn't hurt to have a gunsmith check the headspace before you shoot it, if you haven't done it before. Anyway, you'd get to keep the 30-06 barrel, too, and you could swap back and forth whenever you felt like. It's not as easy as switching barrels on a T/C Contender or Encore, but it's the next best thing. Savage barrels are very easy to switch, no doubt about it.
If you had it rechambered, you'd also have to have the barrel reamed and rifled for the new caliber. If it's not a fairly heavy barrel, there might not be enough metal to have an accurate, safe barrel. At any rate, it wouldn't be any cheaper than just buying the new barrel.
www.midwayusa.comNo other changes will need to be made to your gun in order to make the switch to 35 Whelen. Have fun, and be safe.