The $300 Million Button 18 years ago
It must be Best Buy. Their checkout copy is quoted in this thread from 2005, and matches the article exactly.
http://www.webmasterworld.com/forum22/4423.htm
"you do not need to create an account to make purchases on our site. Simply click Continue to proceed to checkout." "to make your future BestBuy.com purchases even faster, you can create an account during checkout."
Best Buy had close to $25 bil in revenue in 2004 and 2005.