Do prices go up after Christmas?

It is highly dependant on certain contributing factors, I will highlight a few here.

Generally speaking prices are increased over the Christmas period due to the demand on the product, though this is a broad statement and there are always exceptions.

However, some stores will go against this grain and lower the prices in a bid to sell more lower price units than their opposition; it depends no the competition on the product itself.

In the turn of the year, stores generally try to sell excess unsold units at a discount price to clear stock, this phenomenon comes in the form of 'January Sales' where people spend gift money and vouchers purchasing discount goods.

However, dependant on your country of origin this year (Notably England), the VAT will increase to 20% and you may even see an increase on December prices due to this.