Greg,
Couple options to present to you here. First is to just let my parents bring up a couple extra sacks, they drive a jeep cherokee so after you take out space for the 2 sacks I plan to eat and the 2 sacks I plan to put in my lake, there's probably not a whole ton of room.
Second option would involve my little brother, who drives a big Ford F350 and lives in Gulfport, Mississippi. He estimates he could easily fit 75-100 sacks in his truck bed, but the problem is he only gets 9 mpg so it would potentially be an expensive trip (about $150 in gas round trip). Also, he wouldn't be available to make a run until late March. If you can give me a better estimate as to how many sacks (40 lb per sack) you'd be interested in, I can have him start pricing, if we get enough there may be a bulk discount of sorts from the dealers.