We barely sold a small portion of the last turf and that field had both 2004 and 2008 teams play on it. I want to say the bookstore had pieces of turf for almost a year after they initially placed the boxed items on sale.
There was a lot of complaining about amounts but at the list price of around $100 no one purchased. I picked up a second piece for more than half off when the bookstore marked down.
Our fan base can be aggressive with their pocket books, the campaign for the field house is an example. For whatever reason (including a lack of marketing and perhaps too aggressive a price point) the turf did not sell well last time.
I am guessing Field Turf probably recycles the old turf?