I bought the Arkansas Bottle Book 3 years ago and keep it in the truck with me everywhere I go. You never know when and where you'll come across a bottle. If you haven't already gone by the Coin Shop on Garrison Avenue you need to check out his collection of bottles and other local advertising...
I may have personally dug about 10 of these bottles. Everything else has been bought from antique malls, eBay, flea markets, garage sales, but mainly out of personal collections.