The correct ones are the prices shown on the drop down menu when you select between 1, 2, and 3.
1-Year Supporter 1: $10.00
1-Year Supporter 2: $12.50
1-Year Supporter 3: $15.00
The "Christmas" prices became permanent at the end of 2012, they just haven't updated the prices on the chart showing the perks of each contribution tier.