So how do you know if you're getting a fair price? Start by comparing similar devices. Look at the battery capacity—more mAh usually means longer life, which justifies a higher price. Check if the coils or pods are replaceable. If they're not, the device has a lifespan, and you might pay more in the long run.

Another check: what's in the box? A device alone should cost less than a kit. If the price is high, see if it includes extras you'd actually use. And don't forget to look at the brand's reputation. A brand that's been around and has good reviews is worth a little extra for peace of mind.