Please see my earlier answer to this question. I don't know if you realize it, but you double-posted it.Ask a similar question
I believe you mean "contigency" rather than "consignment." It is doubtful you will find an attorney to handle an appeal on a contingency basis.
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There are appellate attorneys that will work on contingency depending on the nature of your case. You have not given enough information about your case.
Just contact appellate attorneys and ask them.