If they are stock axles most reputible shops wont do this and there is a reason. However i had a set of moser aftermarket axles i shipped back to them to do this. I used the box they came in. I made darn sure I put protectors over the splines made darn sure they didnt come in contact with each other. I even staggared them with big end to little end on each. IIRC it cost me like $26 to ship via USPS for 2 axles and packaging.