Often times Edible underwear is found only in "Adult" stores like lingerie, and sex-toy shops, and the legal age there is 18 (depending on what state you live in), However, there are some places that sell gag gifts like Spencer's Gifts (California) that sell item such as those, and I don't believe there are any age restrictions for purchase there.
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You can purchase men's silk underwear online from stores such as Cabela's. Alternatively, you can purchase this item online from retailers such as Amazon.
Going to Russia would definitely require you to buy some thermal underwear. There are many online shops that sell thermal underwear for a good price such as jockey and walmart.
Trunk is not a brand of underwear, it is a style of men's underwear. They are more like shorts and can be tight-fitting or loose. There are many online stores which sell trunks, for example; Alick Alexander, eBay, Fresh Pair and Matalan.
There are numerous companies online that sell custom flags, but the best one is The Flag Makers at http://www.the-flag-makers.com .
There are many companies on the internet that sell latex gloves online. Some of these companies are Just Gloves, Glove Club, Gloves 4 Less and Al Express.
Walmart or Kohls sell underwear.
The companies which sell bookshelves online in Canada are Wallmart, Way Fair Supply and Bookcases Galore. In addition, websites like Home Decorators and IKEA sell bookshelves online in Canada.
Yes, there are online companies that sell metal carport kits. You can find them at www.carports.com/ or the-carport.blogspot.com/2009/05/metal-carport-kits.html
Companies that sell stock are called brokers. Some names of the major online brokers are Nasdaq, the New York Stock Exchange, and the Tokyo Stock Exchange.
The places to purchase solid flooring online are many. Companies that sell flooring include: Flooring Supplies, Wood and Beyond, B&Q, Oak Floors Online and many more.
Men's thermal underwear and more specifically long johns can be readily purchased online from companies such as Jockey Asda and Amazon. 'Outdoor' shops on the high street also sell thermal wear.