This 1929 20c dark carmine Scott #157 "Harvesting Wheat" King George V Scroll Issue stamp from Don's Classic Stamps is in Fine (F) Mint Never Hinged (MNH) condition. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format in its listings, shows a Catalogue value of $45.00 (in Canadian currency) for this stamp. (Item #9629) 
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In the Don's Classic Stamps Ebay Store you will find an ever increasing selection of Canada Stamps and Covers.  Therefore, shop often to have the best choice.