I have read in the internet about a new venture whose aim is to reissue a HP15c clone. You can find about it here:
They show as well some renderings of how the machine would look like:
And you can see that they have been able to produce a working prototype:
There are some informations about price - around 69 CHF. Having lived in Switzerland myself, I can attest that it is not the cheapest country around by a long shot, and still this is a very good price.
There are several considerations when you think about it: