Log on Lexington Craigslist this week and you can find an ink pen for $250, a rubber band for $300, an envelope for $125 or a paper clip for $280. The reason why office supplies are more valuable than gold? They are all being packaged with Big Blue Madness tickets. Hundreds of tickets to the Cats’ marquee preseason event that were given to the general public for free are now being sold on secondary market sites such as eBay and Craigslist. There have been more than 900 tickets sold on eBay, with total sales in excess of $64,000. Big Blue Madness tickets have put on sale in more than 600 postings on Craigslist since they were distributed at Memorial Coliseum and Ticketmaster.com on Sept. 22 at 7 a.m.