actually using a localhost install on MAMP on my Mac.
the iSell plugin seems to create a gallery. but no price or button shows up, and the lightbox does not work either. click on a photo in the gallery thumbnails takes you to a simple image post.
double checked settings. since this is local and a test, have not set up email, nor a thank you page, and omitting a URL for thankyou page is the only thing I did not supply.
did add the suggested shortcodes.