GD::Graph offers you the x_number_format and y_number_format hooks in which you could plug the commifying code. Read the docs under the 'Options for graphs with axes' section for an example.
Disclaimer: I have never used GD::Graph, so this is just what I can guess from a quick look at the documentation for the module...
...roboticusIn reply to Re: commifying charts generated from GD::Graph::lines?
by roboticus
in thread commifying charts generated from GD::Graph::lines?
by Anonymous Monk
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