For an extensive write-up of ecommerce options for Adobe Muse, check out this blog post:
Curious how you can build a complete online store using Adobe Muse?
Check out the video below for a full tutorial, using the ecommerce provider Wazala's embeddable online store. It only took me 4 minutes to integrate the store into Adobe Muse, and I didn't write a single line of HTML code.
For more information about Wazala, feel free to click the banner to the right to let the folks over there know that I sent you their way. I would greatly appreciate it.
Enjoy, and good luck!