I don't sell them, but I can tell you what you need to do to build one. It's not that difficult, the mechanical issues and getting trucks with pickups are the most time consuming. The only "trick" is a special isolated DC-DC converter I get from Digikey for around $10 that isolates the supply to the meters from the track voltage. I got the meters on eBay, they were also in the $8-10 range each.
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