If you want to buy a vape for free, you can follow the vape promotions on vape online shop or vaping sweepstakes on social media, where you may win a free vape.
Or you can purchase bundle products instead, which allows you to get a free vape pod or vape device.
For example, VapePenZone offers you a bundle sale: ELFBAR Lowit 5500 Prefilled Pod Bundle 5PCS (Device For Free), which you may get a free vape device by buying 5 Lowit 5500 pods.