These are sites that I have personally ordered from and received good service, however I cannot guarantee anything as I am unrelated to the companies themselves.
EJuice Connect
This is one of the first sites I used to get cheap ejuice and they also have great deals on devices as well! Their shipping can be expensive depending on your location.
Discount Codes
FSHIP - Free shipping for orders over $150
SPH10 - 10% off Devices
Central Vapors
This is a site that doesn't have as large of a device selection as the other sites but is a great place to get PG or PG based flavorings from. More information about the use of those products are available here.
Discount Codes
Take15 - 15% off Site Wide
ECig Mafia
This is a site that sells a large variety of devices and often has great deals.
Discount Codes
SPRING25 - 25% off Some Devices (they don't specify which exact ones)
Element Vape
This is one of the most popular sites for vape gear in the US, they often have good prices and a large selection of devices.
Discount Codes
LUCK20 - 20% off Devices
Sourcemore
This is a very popular global site, many of the devices are sent from China however they do have US warehouses available for some devices. The shipping often takes a while but they usually have the widest variety of devices which is why it's the main site that's linked.
Discount Codes
GN10 - 10% off Sitewide
Wet Vapes
This is a less known site but often has some of the obscure devices that aren't available other places, like the Smok Mico for $6 or it's ceramic pods for 99¢ per pack.
Discount Codes
716 - 25% off Site Wide
How Do Affiliate Links Work?
Some of these sites (currently only EJuice Connect & Sourcemore) have affiliate programs for people who recommend purchases of their products. When you use my link here then there is a cookie stored in your browser which tells the site that I recommended their site to you, then when you make a purchase I get a small commission of the purchase. You can use any discount codes you'd like but I will try to keep this section updated with the best codes, if you use someone else's link with a discount code (like the Honey extension) then it will overwrite mine unless you click on my link again right before purchasing.
It's like a donation except you don't pay anything extra for the products you'd already be buying anyhow. If this site helped you find what you need without spending hours searching through Reddit posts then it's a way to show appreciation for making it easier for you. That's the entire point of this site, to make it as easy as possible to learn to use these reusable devices instead of disposable devices and cartridges.
If you don't want to use affiliate links for whatever reason, instead of following the links on this site you can copy and paste the text (not the link) into your preferred search engine and find the devices on any site they're available from. Subreddits like r/Vaping have many reviews from most of the online stores which you should check before ordering as there are some scam sites, especially when ordering outside of the US.
International Orders
Most of these sites are for orders from the United States only (besides Sourcemore), as that is where I'm located however if you're from another country and have any recommendations for online stores in your country, feel free to send them to me via the Feedback tab in the navigation bar and I'll look into them to see if they have the devices we use for oils. I know that HHC is widely available in European countries so that's where I will try to find stores first, though that does require feedback from the community to confirm good vendors.