I use pen and paper. I also employ a mattress, blanket, and pillow.

As for your devices, I think you are getting close but you haven't spent enough yet. Summing your purchases, you are probably in for about 300 dollars US. When you get to $500, you are guaranteed a lucid dream. At $1000, you get 10 lucid dreams. And for $5000, you are rewarded with 100 lucid dreams. So keep spending and you'll get what you want. You see, success is all about seeking convenience, especially when it can be purchased. Why apply effort when you can buy it?