Shipping heavy speakers

I've used Uship.com in the past.  It allows you to create a quote for what you'd like shipped, lets you pick the level of service you want (up to and including white-glove treatment) and then lets shippers bid on it, including letting you read reviews before selecting one.  

+1 on U ship, they delivered a pair of Vandy 3a sigs to NC (from NY) with no problem.
Do you have the packing material? If not, I suggest getting them properly boxed and wrapped and put on pallets. At 240 lbs., they will need a forklift. Any serious buyer will offer to pay for shipping and insurance.
B

+1 for the prior post in getting comparative quotes from branded reputable couriers , but with the express understanding that that they are PROPERLY prepared for shipment FIRST to avoid tragedy .

Do you still have the original OEM boxes and (presumed) shipping crates and  other packing materials (Y/N) ?

if not, I would heartily recommend that you first contact the speaker distributor and order up & pay for the OEM replacements as a cheap cost of insurance and peace of mind against getting them banged up and damaged during delivery. 

They are going to be crated and likely also secured to a pallet because of their extreme size and weight,  just even to get them properly insured  for transit
 
There is no cheap short-cut here, so it is going to be unavoidably comparatively expensive. 

Or else ....... full stop.