Here are links to some places on the web I like to visit - for a variety of reasons. The locators are good ones, not too much junk on the pages and good information to find the flea markets, swap meets and thrift stores.
http://www.fleamarketsacrossamerica.com
http://www.swapmadness.com/
http://www.thethriftshopper.com/
http://www.antiquesnavigator.com/antiques-price-guide/mccoy-collectible-price-guide.html
Silver Marks, Hallmarks, Maker's Marks, Copper
www.925-1000.com/
http://www.replacements.com/index.htm
Roycroft Copper
http://www.roycroftcopper.com/index.htm
Lot's of great info here, pricing, marks and thier dates, history, sale items and a friendly site admin that does not mind the occasional appraisal question.
Toys
http://www.antiquesnavigator.com/vintage-toys-price-guide/antique-toys-price-guide-4-SoldPrice.html
Clothing
label resource A-Z
http://vintagefashionguild.org/label-resource-a-z/
Trademark Search / RN Search / WPL Search
http://www.trademarkia.com/
https://rn.ftc.gov/pls/textilern/wrnquery$.startup
