I have an extra pair of the EV HP640 horns (possibly a trio). Please do not confuse these with the HP6040 model (as someone above did...). They are in good shape and are in my garage in Southern New England. They measure 28 wide x 13 tall and 17 deep IIRC. As a ballpark figure, last year I shipped a pair via USPS to Tornonto and it cost about $100.
Keep in mind that the horizontal dispersion is only about 60 deg (down to about 500Hz). Some folks find this a bit narrow. For some reason, they seem sound better than the wider dispersion horns of the same series (HP940).
I would be selling them as a pair, but PM me if you are interested.
In either case, good luck,