Question about PSPlus subscription cost

So my subscription from a gift card ran out a couple days ago. Went to purchase a 3 month subscription when something caught my attention and I was hoping you guys might be able to clear it up for me.

At the main screen it said the cost was $24.99 however when I went to proceed to checkout my total jumped up to $29.99. There was no explanation that I could see as to where the extra $5.00 had come from. Could someone shed some light on this for me?