When transcribing a website address, I recommend that you do it exactly as it would be when it is typed into the browser.
...purchased on amazon.com...
...that great blog on www.margieholdscourt.com...
And though it looks weird, if it begins a sentence, it would not be capped unless it is always capped.
...holynativityparish.org has the information...
Happy punctuating!
Margie