Sorry if you read this on the Digital Point Forum, this is what I was looking for:

So I've been put in charge of trying to find the right way to go about getting this print company's business online, and they were thinking it would cost like 100 grand or so then I was turned onto various do it yourself e-commerce engines like Shopify, Big Commerce, Magento, etc. and I was wondering if anything like that allows for uploading of files when customers are checking out? Would be a huge plus if you could see artwork displayed on product as well.