Check the listing for details. CHEAP PROMO CARD: MARS ATTACKS! INVASION (Topps 2013) #0 SAN DIEGO COMIC CON. Condition: Ungraded. Listed at 4.50 USD. CHEAP NON-SPORTS PROMO CARD SALEONE FLAT SHIPPING FEE PER ORDER CHOOSE FROM A WIDE-VARIETY OF PROMO CARDS & PAY ONLY 1 FLAT RATE SHIPPING CHARGE NO MATTER HOW MANY PROMO CARDS YOU BUY THIS LISTING IS FOR ONE SINGLE "PROMO" TRADING CARD. YOU WILL GET THE CARD LISTED IN THE ITEM'S TITLE & PICTURED (front & back).Winner agrees to send payment within 7 days. Thank you for the business! A Little Something about Promo Cards: Promotional trading cards (sometimes called PROTO or PROTOTYPE or PROMO cards) are usually given away by the manufacturer of the cards to dealers & magazine publishers to help promote their upcoming card release. Most are standard sized cards (2.5" X 3.5"). They are typically made available to the public before the release date of the cards. Most often Promo Cards are exact samples of what the front of the cards will look like once officially released & usually they are specially numbered (P1, P2, #0, P, etc.) to tell them apart from a regular card. Usually the text on the back of a Promo card talks about the upcoming set. Sometimes it looks just like the back of standard card. Some promo cards are released in limited quantities & some are down-right rare. Some Promo Cards were made for planned sets that were then later canceled. These factors have helped launch an entirely new genre of collectors in the trading card market.