Welcome to the Q&A Forum

I would say that integrating it with the site would be the best option.  When dealing with eCommerce I like to think that the least confusing you can make the process the better they will accept it.  Unless what you sell is extremely interesting no one is going to read it but the SEO rich pages you can create will be priceless in serps. The big issue is when they find their way to your site through the blog content do you want them to be on some weird page that seems questionably attached to your eCommerce page or one that is integrated with it fully.

Hi, I had a quick look it seems this site has around 2,000+ pages of content in a different language on a .us domain, so they are targeting people who speak chinese I believe from the US market. Quite a good idea I guess, I also believe the competition would be lower as .cn domains would not have the same power as the GEO rich .us domain. If you have great content, a huge number of pages and a few very targeted high quality links you can rank for a whole lot of long tail keywords. Regards, James.