I never thought I would like "coloring". I started taking a Copic class once a month at my LSS and now I own about 200! Before you start buying them, watch some You Tube videos. There is a certain way to purchase them (has to do with the number and letter sequence).
I also buy digital stamps. They are much less expensive than regular stamps and so there are LOTS more things to color!
I have been interested in Copics as well, but $5-8 for a pen (depending on where you buy) is a tab bit costly. Now my LSS offers a class for $10 I think and you get a free pen out of the deal. I guess it's worth a try.
Another option is to try the Kaisercraft Fusion markers. They too are alcohol markers (for blending, shading and coloring on many different surfaces), but since they are not refillable like Copics they are offered at a lower price.