Depending on what sort of barrel you want, the costs could be roughly the same.. or could be considerably more for either option...
The JES option is $250...
You can pick up a decent 35 Whelen Barrel for as little as $100 (I paid $92 for my 98 Mauser barrel in 35 Whelen from Midway a few years back).. and if you have the right tools (barrel wrench, a decent vise, etc)... you can swap the barrels out yourself.. then rent a reamer to finish the chamber (about $50 to rent one).. and youre done.. This is what I did.. and I was able to turn a 8x57 into a 35 Whelen for less than $150 and less than 1 hour of my time.. (cheaper than the JES option.. and I enjoyed the process and the DIY project.. its a lot easier to do than you might think...)..
You can just as easily spend $700 or more rebarreling.. if youre wanting something like a Shilen or Douglass Air Gauged barrel.. youre going to pay for it.. and depending on what gunsmith you hire, you could be looking at $65 for an hour of their time.. up to $200 or more.. and then youre still going to need a finish put on it which could run you anywhere from $60-$200 depending on what you want to do..
A happy medium in terms of cost/quality might be to go with something like an ER Shaw Barrel.. you can get a barrel from them that is threaded and in a standard Rem profile, with a short chamber for $220.. They'll do the fit, install, and finish the chamber for you for $130.. Shaw will also finish your barrel for you (blued) for an additional $130.. which would put your total at about $480..
