There are numerous ways to get your axles. After much looking and price checking, I decided to order mine through Colin Hyde at(518) 578-7772).
(Home (Colin Hyde Trailer Restorations)
) . He has been doing Airstream restorations for years. He gets his axles from Axis corp. You have to give Colin several measurements and he will place the order. Yes, he is a middle man, but the premium for his knowledge and help was tiny. Give him a call.
They ship the axles from the factory and I think the turn around time was only a couple of weeks. I would suggest having them delivered to a business address with a loading dock. Freight companies charge less when delivering to a business. I used a buddy in the HVAC business. He unloaded them with his fork lift and then loaded them on my utility trailer.
Installation on most trailers with most brands or axles does require either holes drilled or tabs for the shocks welded,depending on brand of axle. The axles are heavy and it is not a one man job. Two men and a couple of big floor jacks are a must. If you are going to hire a shop to install them, I would still buy them through someone who is familiar with ordering for Airstreams. I think around $400-$500/axles plus shipping will be about right. Some places charge much more. Shipping will vary but if I recall the freight was around $225 for the pair.
Good luck with your project.