Alcohol Inks have become a popular trend over the past few years and quite a pricy one. Ive been using alcohol markers for years and while there are many, many brands of alcohol markers with hundreds of colors to choose from, Sharpies will always be my favorite. (I'm not great at blending them anyway) They are not however, refillable like Copics are and most them have a ton of ink left in them even after they quit on you. I made my own alcohol ink with my 'retired' markers and was able to get a ton of ink in a bottle from even just one marker.
I must note that the standard alcohol inks you can buy from Tim Holtz for example do have a small amount of resin in their chemical makeup which makes them not dry out as quickly and are more archival than our homemade ones we're going to endeavor in making. If you want to try out alcohol ink with out going all in- then make your own to see how you like them. I've had a blast using them!