Overstock.com has surpassed $1 million in sales generated from Bitcoin transactions. The retailer partnered with Coinbase on January 9 to let consumers purchase items with the digital currency, meaning the milestone was achieved in less than two months. As you can see in the charts above shared by Coinbase, more than 4,000 customers made purchases with Bitcoin on Overstock.com in some 50 days. The average order size for a Bitcoin customer ($226) was 34 percent greater compared to customers paying in USD ($168), and over half of all customers paying in Bitcoin were new to Overstock.com (58 percent), having never purchased goods from the site before. Those are impressive results, but the real test will be to see how those numbers hold up.