LaRue,
Have you thought about putting a little laptop and printer in your work van and just print out invoices at the job site?? Most companies do that now and avoid the hand written invoices that are hard to read...especially if you have handwriting like mine..:grin:
When I was running my own consulting firm, I used a free downloaded MS Excel file that allowed me to insert my company name, logo's etc and fill in the detail charges and notes on the invoice or you can download some free MS Access apps with the database that will do the same thing. The system always generated a new invoice number and it was easy to make corrections and reprint the invoice as needed.
There are no printing charges, format is easily changed whenever you want/need to, and you only pay for the blank paper, and the ink to print them....If you need two copies, just print it twice....but you always have the Excel file or Access Database for your records. so you don't really have a print a copy for yourself. That also allows you to do reprints of invoices if the customer need another copy.
...Rich