Warning: The size of the box makes a huge difference. You really want it less than 108" length x girth for USPS (which won't happen with a 26"bike) and less than 130" for the others. If you can't get it below these, it will be cheaper to do two boxes! After the 130" the price skyrockets!
I second avoiding UPS if possible-they are the slowest and from my experience and stories, the most likely to bash up your box
Also, take the time to set up an account and pay online-it will also save you cash.
What that guy just said. There is an "approved bike box size." I don't know if it varies among shippers, but a 1 inch difference can cause the price to double or triple. If you're not sure on the size, call and give them the specs of your package, they will tell you the price, then if it's like $100, subtract an inch off the longest side, and do that until it drops. Then you go your bike size. Also, you can check with the LBS, a lot of them could probably be able to tell you the right size.
Last time I shipped mine across country I used Aircaddy.com. It costs a bit more but the box provided is pretty good with good securing for forks, wheels etc. It goes Fedex and mine arrived in quick time with not a scratch. Depends how much you value your steed I guess...
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