Sales tax will only apply to Texas residents.
We do sell these licenses in 5-packs. You have a max of 2 RDP connections to your server by default. If you add the 5-pack of terminal services it will remove those 2 original connections, and you will have the total of 5 licenses. They are $5/month each so the 5-pack will be $25/month.
The best way to purchase additional bandwidth for your server is to open a "Sales" ticket, requesting additional bandwidth. Please specify the amount of additional bandwidth and the server you are requesting the bandwidth for.
Note: Bandwidth is only available in 1000GB increments or as an unmetered service.