The USPS charges extra postage to mail items more than 1/4-inch in thickness.  Thus it costs $1.71 to mail one pillow via first class mail within the US.  (I simply apply four first-class stamps to avoid a trip to the post office.)  For more info, you can calculate postage here:
http://postcalc.usps.gov/
If you do not apply sufficient postage when you mail a pillow, it gets delivered "postage due" or sometimes even requires a trip to the post office to retrieve the package and pay the extra postage.
			FYI: Mailing Tip for Newbie Pillow Traders
FYI: Mailing Tip for Newbie Pillow Traders
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| Mask: AirFit™ P10 For Her Nasal Pillow CPAP Mask with Headgear | 
| Additional Comments: CPAP 6/5/2009, Rx: 11-16, OSCAR | 
 
                 
                         
                         
                         
                         
                         
                         
                         
			 
	