Click on that big blue button on the lower right corner of your screen. Input your credit card information. Click on the amount of Crystal Energy you wish to pur- help the community by. Click on purchase. A few clicks later, and you've made a contribution to lower the crystal energy prices! You're a good person!

P.S. I love OOO for their absolutely insidious money-making policies. The Crystal Energy market is just... brilliant. Simply brilliant.