If your front yard if flat you need 21 stones for each layer your would like to build. A typical retaining wall around a tree would require 3 layers. If your front yard has a grading, you have to see how many stones you need depending of the grading.
How much does it cost? As of 2010, the 4-day passes to Comic Con were $100 each. However, it increased as the years went by. According to WhenNerdsAttack.com, the 4-day pass with preview night costs $175 for adults and $87 for juniors, military and seniors.
Comic-Con, held each July in the San Diego Convention Center, typically attracts more than 130,000 attendees. Tickets last year sold out within an hour. Comic-Con's annual online ticket sale Saturday morning brought cheers and groans from its biggest fans as badges for the four-day event sold out in record time, just under an hour.