Why not buy one decent pen “shell” and then just buy the plastic tube with the tip and the ink afterwards?
I know many companies use pens for marketing but still, they could apply this too and also stand up for the environment while still do marketing.
They aren’t cheap, but I have been very happy with pens from tactile turn. They have a newer aluminum line that are a bit more affordable, and they all take regular pen refills.
I have a few cartridge pens which are nice but the tactile turn pens are a better balance of convenience for me.