Performing your effect at a local magic club will also gain interest. Be sure to ask the club scribe to write it up in the monthly journal.
You might also try submittting some of your better creations to GENII. I did this in the 1970's, about the time that my first book, "The Propshop: E-Z Tricks With Magical Accessories" was published by D. Robbins.
While the GENII contributions did nothing to fatten by wallet, it helped create name recognition, which helped get my first two books off to a good start in the magic marketplace.
Lastly, eBay is also a good marketplace, if you are prepared to manufacture the effect yourself. If you go this route, you may find it helpful to ask a write to edit your instructions so that they are easy to follow.
Good luck with your creative efforts!