Allegro is an online trading platform that allows to carry out the transaction. Allows primarily offer for sale of items owned by the user. Thanks to access to the Internet service in the early days became popular among collectors, and sometimes even professional traders. In addition to the auction it is also putting up for sale the subject at a predetermined price (Buy It Now). There is also the opportunity to combine auctions and Buy It Now. At present, the vast majority (approximately 90%) offers available for gadgets that offer only a Buy It Now.