In June, Shopify (ticker: SHOP) took another step toward becoming a viable alternative to (AMZN) (AMZN) by unveiling the Shopify Fulfillment Network, which gives merchants cheaper shipping, warehousing, and picking/packaging services. Earlier this month, Shopify announced an agreement to acquire 6 River Systems, a provider of warehouse fulfillment solutions and automation robots, for about $450 million. Two founders of 6 River were previously executives at Kiva Systems, which was acquired by Amazon.com.