I didn't see any post about this on EGL, but I thought it'd be useful to everyone who's planning to sell/buy from the US. There was a price increase and weight change in postage and parcels for USPS effective on Jan 29th, 2013. You can see the details here: http://support.pb.com/library/PBKB/files/Support%20Center/pitney-bowes-quick-guide-to-usps-prices-2013.pdf
The change of price to international shipping is especially significant.
 Beginning the week of August 5, 2013, the U.S. Postal Service will stop delivering mail on Saturdays, but will continue to deliver packages six days a week. Saturday mail delivery to P.O. boxes will also continue.