I just took my 1st delve into DIY, and my choice was between 2 shops - Wizard Labs & Vapor Shots. I had a set limit due to my card balance, and was leaning towards Wizard cuz of their more extensive flavor selection. So I added nic. base and PG/VG to my cart, to check how much shipping was gonna cost - came to $9 for USPS Priority. I added my flavorings to the cart, knowing my limit, and proceeded to checkout. After adding 7-8 of the smallest size bottles, shipping was now at $12.50, which put me OVER my limit. Now as far as I kno when you're shipping stuff Priority, there's a flat-rate, and I thought this was a little stingy - it left a sour taste in my mouth. I then headed over to Vapor Shots and did my same check on shipping, after adding just my nic/PG/VG. USPS 1st class was $6.99, which I was much more attentive to. I thought there'd be a chance of it going up after adding flavorings, but lo and behold, shipping stayed at $6.99. I was able to order 11 bottles of flavoring w/ the same base ingredients I'd have gotten from Wizard. Based on my situation, this made my choice much, much easier - and I now have my 1st DIY order from Vapor Shots on the way!