I was trying to buy miles on the BAEC website. I am a general member, with 100,000+ miles but I do need a few more for an award.

When I went to the website, I was required to log on. After I logged on, the purchase page displayed a message: Our records show you to be less than 18 years of age, or some such verbiage.

Long question short: how much does it actually cost to buy miles?