eBay with Best Buy has the Tru Grit 40-lb Cast Iron Kettlebell on sale for $30 with free shipping. 75 cents per pound. Best Buy also has it for $30, but only with store pickup. Other Kettlebells on sale include:

• 26-lb Cast Iron Kettlebell for $22 (pickup only, 85 cents per pound)
  
• 44-lb Cast Iron Kettlebell for $45 ($1.02 per pound)