What is the difference between stores for "Add to Buyee" and other online stores within Buyee?

"Add to Buyee" enables customers to add items to Buyee cart directly from various Japanese online stores. Unlike other online stores within Buyee, ordering from stores for "Add to Buyee"  is only possible through the "Add to Buyee" tool.
Please note that there is no Item Detail Page for stores for "Add to Buyee" on Buyee website.
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