Charges approximate our actual costs 
     for postage and 
          packing materials; we don't charge 
 for   "handling."   
          Parts shipped free with other items; 
  $6.00   if shipped alone. 
          Single book, student slide rule, 
or  leather    case shipped in a padded envelope: $6.00. 
          Single pocket slide rule or anything 
  else   we can ship in a USPS “Small Flat Rate Priority Mail Box:” $10.00. 
    
          Everything else (Priority Mail): 
$16.00.              
Items costing $20 or more are automatically 
insured at USPS rates.    The Slide Rule Trading Co. provides the 
insurance; we no longer use USPS insurance.  (That decision was prompted 
by a claim where the Post Office seemed to do everything in its power to
delay settlement.)