Not sure if this is where I should post but, What's the most cost efficient way to...

[cdiaz]

ship a guitar?

[ef_in_fla]

If it's a bolt on remove the neck and ship it UPS in a small but well packed box.

[Lance Romance]

The most cost efficient way is to not skimp on anything. Ship via fedex or ups and have a tracking #.

[Pax]

USPS is the least expensive, but regardless of the shipper you use pack well, pack very well.