The scary looking guy is Fabiano Iha, a super-nice guy by all accounts. You can think of him as a "celebrity endorsement".
You may order pants at this link
On the left hand side is the price for white or blue ($30 US). Make sure you use the sizing chart (on the left hand side).
For a complete gi, I would order the competition single
Again, the left hand side shows the price to range from $50 (unbleached) to $80 (blue). Make sure you use the sizing chart (on the left hand side).