LS, where are you?
Those down South (FL, Southern CA) can always get it cheapest.
Those of us in the states that get snow usually have to pay more.
BigTank's advice is good, but can backfire. You can't be sure there isn't something 'wrong' with the LR, such as an infestation, or bad trace elements (copper) that have seeped in.
I paid 6.99 the last time I bought a tank's worth of rock, and I'm in the NY area, for reference.