Why so many different prices for the same product on Norton web site?

I have so far found four different prices for Norton 360 on the Norton web site: $89.99, $79.99,  $49.99, and $40.00. The second highest price is the one I pay if I renew my subscription from the 360 screen on my computer.

 

*  Why so many prices for the same product?

 

*  Can I tell on the Norton web site which version I'm getting with these different prices? I can't see that they supply that information.

 

*  And why does Norton automatically offer me one of the highest prices with renewal of my subscription? It seems as their customer I should be treated better than that.

 

 

D.