I've seen Penn 130STs for as low as $500 to as high as $1000. Also saw a BNIB Penn 130 ST that sold for $900 shipped to your door by a THT vendor. A well known/liked work horse reel that's on the easier side to service, they definitely fetch some money still if they are clean and near new condition.
With that said still looking for one to add, and doesn't have to be an older Penn. Figured I'd throw it out there if someone had a spare or one that's been sitting for awhile.
I have a Penn 130H that I completely went through. New bearings, upgraded to carbonex drag washers, etc. Its spooled with brand new 200 pound hollow core and 130 mono. I also have an extra brand new Shimano Tiagra 130 in the box.