One challenge in buying high-quality menswear is the price:  the best items can be prohibitively expensive, and may sell out quickly.  Arun Gupta's solution to this is Grailed.  The site connects sellers of premium pre-owned menswear with buyers who then negotiate a price.  Grailed has an incredibly huge selection of pieces, ranging from Uniqlo basics to Common Projects shoes to Saint Laurent leather jackets.

Check it out here.