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.
Many teen attendees ask for VidCon tickets as their birthday or holiday gifts. Some families plan their entire vacations around the event. Tickets start at as low as $100 for early bird buyers and as high as $750 for regular Industry attendees. That doesn't include food, travel and hotel costs.