This is probably too late for you, but I've found that bulk cable pricing from L-com,http://www.l-com.com/productfamily.aspx?id=6249 gives you far better pricing on LMR-400-type cable, either by the foot, or by the roll. Service and delivery prices are both good. A buddy and I split a 500ft roll and paid about $105, each.
Any place around central New Jersey, USA, that carries Times Microwave's LMR-400? I know I can get it shipped but was hoping to get it in the ground by this weekend. Thanks.
PS, I need about 110' of it.