Keep your eye on Craigslist and
ebay. There are plenty of good deals to be found. A few weeks ago on Craigslist I picked up all the mints sets / yearbooks from 79-93 and several sheets (the birds, wildlife series, 1986 president sheets, and a few others for $100. We had a snowstorm the next day so I was bored and decided to add up the face value and it came to $234.68
Things like that pop up all the time. Probably could have even talked the guy down to 80 but didn't bother. I knew I was getting a pretty good deal at 100 without adding it all up