After extensive research, I finally found an online billing service that is exactly what I need for StationV.com. At the basic level, 25 invoices/mo - for only $5 USD per month, Simplybill has proven to be perfect for my needs. I have been using it since February 2013.
Here is their blurb
Simplybill is a web-based invoicing tool that lets you create an invoice, send and track it. Create invoices for your time, or the services you offer - or both. Send "Thank You" notes when clients pay, and reminders when they are overdue.
Visit their site: https://www.simplybill.com