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 Hinged (MH) condition. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format in its listings, shows a Catalogue value of $47.50 (in Canadian currency) for this stamp. (Item #9634) 
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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.