At first I tried with a Canadian website, so I tried with a US url (the message confused me), but it still gave me the error, I checked the response and got the following:
{ "error": "New photo and listing checks are currently available in the United States. More regions coming soon. You can still view saved reports.", "code": "read_region_unavailable", "recovery": "region" }
I figur it checks the requester's ip location.
You'd only need to make one request per component per week or something, how limited are you here? Sounds like a harsh limit.
Some feedback on your website. I would suggest moving the "try it" from the bottom of the page towards the top of the page so that visitors don't have to look for it.
I was disappointed to see Costco selling high margin PCs.