Edit license URL

I'm down to the last change for my five licenses. Still editing them from when you switched from unlimited sites to five sites. :-)

Can you remove this site advancedrvcenter.com

And add this site in it's place http://sireps.com/

I probably will need to buy another 5 site license soon, adding additional sites hopefully. Can I get a discount on a purchase of an additional 5 site developer license or do I have to pay full price for the additional developer license?