Here are my book selling stats for May:
Selling Stats
Number of Sales: 43
Sales: $478.01
Shipping Credit: $183.57
Inventory Costs: $118.38
Amazon Commission: $129.79
Shipping Costs: $123.28
Amazon Marketplace Membership: $39.99 (Recurring monthly fee)
Scouting Software: $30
Refunds: $7.69
Total Profit: $212.45
Best Sale of the Month: Encyclopedia of US Labor and Working-Class History - purchased for $3 at Goodwill, sold for $100 within 2 hours of listing on Amazon.