We do have farms in South America that produce them. We have carried them a few times in the past but there hasn't been enough demand for them to bring them in on a consistent basis. They cost us much more than regular roses because they are more labor intensive to produce. They take a white rose and inject different colors of dye into the petals. We usually have to buy them 150 stems at a time. If you could buy that many than we could likely get some in for you! (It's too late for Valentine's day though, we need a few weeks lead time as they are grown, produced and shipped from Ecuador).
They have many varieties of flowers, but I've never heard of a rainbow rose. They sound beautiful. Good luck.
Thanks! Your answer is awaiting moderation.