I opted to see if I could expand the MACRO provided in the POD - worked well enough for my need but ymmv: 
[%- MACRO commify(n) GET n.replace('\.\d+$','').chunk(-3).join(',') _ 
+n.replace('^\d+', '') %]

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In reply to Re^2: Template Toolkit Formatting Data Question (sprintf and commafy) by Anonymous Monk
in thread Template Toolkit Formatting Data Question (sprintf and commafy) by Tyraziel

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