[Seeking a homebrew Light Pen]

Hey everyone, I am looking for an affordable homebrew or after market light pen for the Vectrex. I am in the US, so ideally from there, but overseas is fine too. I have come across Madtronix, but after e-maiiling haven't heard back so I am unsure if those are still available for purchase. I've looked around a bit, but I am struggling to see what is available to ship. I'd appreciate any help!

 

Thanks!

[Vectrex SD Cart?]

If you still have any VecMulti available, how much are they shipped to the US?