For a 5x2x2ft tank it is better to buy from the following marine LFS as they do home delivery:
1)Irwana 6583 3536
2)Pacific aka "Ah Beng" 6585 0235
3)New Trio Fisheries aka LCK201 8448 2260 Steve
4)OceanSing 8482 2670
I suggest you buy a refractometer to check the salinity & ready a pail for RO/DI water & of course salt too. Our famous "SEA" aquarium also buy water from one of the big players up there