generating valid comps

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Hey guys so i have a question about generating valid comps for a deal i plan to wholesale.however i cannot find properties that sold in the last 6 months withing 0.5 mile radius that have similar bed and baths. Although Lots of properties have been sold within the area, only about two of them have the exact same number of bed and bath as the property i plan to wholesale. How far out (mileage) should i go from subject property to find similar properties to generate  valid comps??