I'd roll the dice on yoox or eBay before resorting to MW and that sport coat in particular. Grey sport coats are difficult to pair with trousers, the lapels are too thin, and the shoulders look heavily padded. Also, check the Allen Edmonds shoebank website. They occasionally have 2nds for $100, and you can usually find a decent selection at $150.
2/5/16 at 5:20pm