CannaAid is running a buy-one-get-one-free promotion on all of its vapes sitewide. Combine the current sale with a still-valid discount we posted earlier, and you can score 4 1 milliliter disposable HHC vapes for $25. Simply add one or more of those vapes or any other to your cart, and your free cart or pen should automatically show up alongside it. Shipping is a flat $5, so there are some good deals to be had even if HHC is not your thing. No word on how long this promotion will last.