As intended for my Halloween costume, I actually made my corset. A rough total of the materials would probably be around fifty dollars -that is, if you already had a rivet gun and rivets. If not, add about twenty dollars to your budget. I think boning was the most exensive for me. That was probably near twenty-five dollars.
As I do applaud your desire to wear a corset, I do not recommend anticipation of wearing your first “impeccable” corset you made [Unless you sew proficiently]. I only used one pattern prior to making the corset. I was [and still am not] adept to sewing. I was a bit difficult in myself, it was evident that I wasn’t too great. However, dispite the cost, I do recommend one making one. It is quite fun to see your progress.