AncestorsAtRest has the following store ledgers online for Pennsylvania
Mill Creek Township, Lebanon County, Pennsylvania 1885 to 1890 Mountain Spring Mills Ledger. Over 800 entries with names. PDF file available for download
Elk Creek Township, Erie County 1876 to 1878 General Store Ledger. Over 4000 entries with names.
Lower Heidelberg Township, Berks County 1874 to 1903 Farm Ledger of John W Gaul. Many Local Names.
New Hanover Township, Montgomery County 1858 to 1904 Farm Ledger. Also includes some names from Berks County and Bucks County.