It sounds like you should simply bite the bullet and ask a friend, relative, or neighbor to pick you up some seed the next time they go to the store. Don't be hesitant to ask for a favor....they are so easily returned in kind.

Wow, great shots of some handsome birds. We only discourage House Sparrows which are not native. It appears to me you have an American Tree Sparrow because of the dark upper bill, and the yellow lower bill. My pictures have been terrible lately because it is always too dark out. You got some really nice action shots there.

Okay great! Wheres the cheapest place to buy these in bulk? Costco also had a filler seed with their sunflower. I have to steralize ir in the oven now so it doesnt sprout anymore.

How large a container do you want? I bought some nice small containers online, but we store our 40 lb Black Oil Sunflower Seed sacks in discarded plastic 50-gallon drums, formerly used to hold soap powder, we found behind a small Carhartt clothing factory in town. We have two on our deck-one barrel for sacks of horse feed and alfalfa cubes, one barrel for sunflower seed sacks. So far, no rodents have been able to chew through the heavy plastic, or climb the sides. We leave the feed and seeds in their original sacks, and simply remove them and put in new sacks as they empty. The barrel lids aren't airtight, so we use old blankets folded and laid across the tops of the barrels under the lids to seal out damp air and prevent mold.