As it stands, the US pricing is $7.99, $19.99 and $49.99 depending on the above-mentioned durations. That will jump to $9.99, $24.99, and $59.99. Canada's one-month membership will go from $8.99 CAD to $9.99 CAD, while the UK's rate will jump from 4.99 GBP to 5.99 GBP, and 12 months of Xbox Live Gold will be 599 pesos instead of 499 pesos in Mexico.
Ahead of those increases, Microsoft is offering a "discount," charging US customers $39.99 for a year of Gold. While that may be lower than the official cost, you can typically find a similar (and often better) price online.