Welcome to Quick Tip Tuesday! I've read a number of posts in which crafters have indicated that they have used their own homemade pop dots (dimensionals). I came across a video put together by a Fantabulous Cricut follower, Janice from Cricutology, which explains how to make pop dots. What I really like about this idea is that you can purchase foam in different colours so dimensionals will match your paper and be less obvious when the card or project is viewed from an angle.
To make your own pop dots, you will need foam and a Xyron (or similar). I also came across somebody describe that they make their dimensionals with 2-sided tape and foam.