There's a blue link towards the bottom of their front page that takes you to the Card Payment Form. You can calculate your total and send payment but some seed might not be available, then they'll either contact you to credit your card back or substitute something. They are very professional but also very busy so it helps to make your order very clear. You don't need to list the price or description of the seed. All you need to give them is the catalog number and how many you want. Use the letter H for packs of 100, X for smaller packets. 2X = 2 small packets when lots of 100 are not offered. It should look like this:

1550 - H
1573 - 2X
1591 - X

It just makes it easier for them to print and read your order. Good luck with your sowing!

Here is a link that might be useful: Mesa Garden Secure Credit Card Payment Form

It's new year, they probably still in vacation :D

I ordered from them few month ago, they responed my e-mail within 24hours, and I paid Paypal.

As hanzboro wrote, they might run out some of seeds, so write several substitute or just request for refund.

Good luck and happy gardening.

Thank you I suppose I should wait a week or so for a reply from them.

I will be posting soon for help with my seedlings! haha