Software for stamp dealers/sellers

Does anyone know of a good program for selling U.S. stamps? One that works well with HipStamp? And, of course, keeps track of inventory and sales and comes up with monthly/annual profit and loss statements for IRS purposes? And uses Scott catalog prices? Hopefully one that will assign a purchase cost to each stamp in a collection I will buy, based on its percentage of overall catalog value?

Thanks.
Bob
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