CKnine, many of the online vendors mix fresh when you order. This is because many of our vendors are small businesses, some with only a few employees, some one person does it all. So they cannot afford to premix they're nicotine sollutions into large batches and risk one bad review that slows that particular flavor from selling. This also prevents premixed juices from sitting and going bad. The shelf life of a batch of juice is around one year from mix date I believe. As I write this, I'm also thinking that 1 of the main reasons a vendor probably does not pre-make juices is to ensure predictability. If they premix, and you order the blueberry coffee from them in January, and you happen to get a newly made batch.. Then, if you order in February, if its the same batch, it has steeped. This means that you'll get steeped blueberry coffee and it will taste different. I think any multi-flavored juice is going to benefit from steeping, because steeping allows flavors to mix and meld together to create a more solid flavor.