I have created a batch file for use with Paypal's MultiOrder shipping. This batch file formats the addresses you supply into a simple CSV file. Simply copy the addresses from a trade and paste it into the program, import the finished CSV file it into Paypal, select your shipping options, enter your package weight, and print all your labels at once.
Note: Your browser will say this file could be potential dangerous; while it is true the batch files can be dangerous I assure you there is nothing dangerous about this one. All batch files get flagged no matter what is contained and it is all open source.
Note 2: Does not work for international addresses or addresses with more than one address line, Yet
You also need SED and GAWK from GNUwin32 for the script to work. You can get these here:
Link to Paypal's MultiOrder shipping: