first, grab Beta 21 as it includes some performance enhancements for AppleScript. Here is an example AppleScript that changes the starting bid of the selected listings:
tell application "GarageSale"
repeat with theListing in (get selected ebay listings)
set the starting bid price of theListing to 12.0
end repeat
end tell
If you get weird four letter codes insert into the script, make sure that there’s no copy of GarageSale 6 on your Mac, as the Script Editor application gets confused by two applications named GarageSale on your Mac.
Compressing your copy of GS 6 as a .zip file is a good way to hide it from Script Editor without deleting it completely.