If my last post about invoicing seemed more robust than you currently need, consider one-off almost instant invoices. You can quickly input your numbers and information and you can even add some slight customization to the webforms. Once you are done you can print them off or save them as PDF files, the choice is yours. Either way you'll have a quick invoice that still looks professional and doesn't consume a lot of your time to create.

There are two resources that are similar but may offer slightly different approaches. Check them both out and see which would better fit your needs.

• Billable - I have used this resource a number of times myself. It is intuitive and clean.
• Invoice-o-matic - I have recently found this resource. It seems very clean and intuitive as well. It offers a few settings that you can change like type of currency.