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Yep, was the tanks that got plastered during the engagement in during first strike. There's sometimes referred to as UMT's or 'That Ancestor's damned Death Trap.'
I think that based on other tanks and vehicles in the setting, a safe bet for a "Cheap" tank without much in the way of high technology is somewhere in the neighborhood of 7,500-10,000 or so. That's about as much as some cars cost.