Free heightmap (elevation?) dataset for Kraków, Poland?

Question

Is there a freely available (governmental?) heightmap (=elevation?) dataset for Kraków city (in Poland) with horizontal grid ~5m (or better) and vertical resolution ~ +/- 0.1m? Ideally, it would include building heights (i.e. not "ground level").

If you don't know one, at least do you know of some good open forum where I could ask such a question with some hope of getting an answer?

Sorry if that question doesn't use proper terms and/or is too unclear, or otherwise totally ridiculous; I'm totally unexperienced in GIS.

Answer 1

Wow, wow, wow, based on @scruss's hint, I maybe have found something; not exactly free, but really, really cheap (i.e. not "bussiness prices" but "average guy prices" apparently); only I must yet verify if the data is really good enough for me and what I think it is, but there are some samples. Without further ado, the links are:

http://codgik.gov.pl/index.php/zasob/numeryczne-dane-wysokosciowe.html - an overview of the available subtypes of data, and details on how to request them;

http://codgik.gov.pl/index.php/obsluga-klienta/oplaty-za-udostepnianie-materialow-fotogrametrycznych.html - pricing (seems 2-4zł per km² IIUC, which seems totally approachable).

(Note: found based on information in a GUGiK video.)