$19 sounds like 3/4 inch T&G subfloor, while the $12 at the Big Boxes sounds like 1/2 inch OSB sheathing (from our lumber supply yard it's $23 for T&G and $6 for Sheathing). Make sure you've got Apples to Apples.

Rent a panel lift for a ladder, and get someone on the ground to load them on and shoot them up to you.

Lowes said it was "just smaller than" 3/4", it was some X/32 thing, and it was T&G used for flooring. I'll have to nail down the specifics again, but seemed very comparable. thanks for the lift idea!

If you're willing to do a little legwork, you can save a good bit by going with Lowe's . Go to your local builder's supply and get them to to give you a printed out quote for the OSB. Then take it to Lowe's and have them price match it; they'll beat the other guys by 10%. I recently bought 7/16 OSB sheathing for $4.87 a sheet, which is 10% off of the lumber yard's price of $5.41.

We lifted it with the pulley system. Yay! Here's a video of it. (77Mb, so be patient)

Here is a link that might be useful: Using a pulley to pull up OSB

I get page not found for the video.