Here's a tutorial for how to order your own BillStamp stamp, completely bypassing BillStamp.com and using a 3rd-party stamp-printing service. This offers the additional advantage that you can customize the stamp however you want; edit the text, get a fancier/cheaper stamp model, start your own version of BillStamp.com, whatever you want!

Here's the tutorial (Cost: $23 [free shipping!]) on how to order your own stamp from a 3rd party stamp-manufacturer:

1
Download the Original Image File

Click on one of these designs to open it in a new tab:

Then, with the full-size image in its own tab, right-click it and save it somewhere you can get to it easily (the Desktop usually works).

2

RubberStamps.net

I've scouted lots of sources, and RubberStamps.net and RRSE.com are the cheapest. Go to their "Self Inking Stamps" page and get one of these models: Trodat 4927, Ideal 300, or S-830. RRSE has free shipping on orders over $10!

tutorial step 2

3

Choose the Trodat 4927 stamp

I've found this to be the best stamp to give both a good price and a large image. It also comes with its own inkpad and is easier to use than the cheaper "art-mounted" stamps on the site.

tutorial step 3

4

Select Image

Click this button and go find the image you downloaded in Step 1.

tutorial step 4

5

Verify Preview

If my calculations are correct, the preview shouldn't give any problem. But if you want it smaller or bigger (you shouldn't have to go bigger; the provided image has practically no margin), you can adjust that below with "Scale Uploaded Image." When done, "Add to Cart!"

tutorial step 5

Step "DONE"

Do I need to spell out the rest for you? Click "Secure Checkout," add a replacement inkpad if you want (I suggest red to catch the eye, or black for clarity), let your e-shopping skills take over, and you should be stamping bills in about a week!

And once you have a stamp...

Here are some stamping tips.