Audiority Modular Piano
The price is actually 12.5 Euros until the end of the month.
I like it a lot on first impressions. 27 NKI and 4 multis cover a lot of sonic ground and IMHO is well worth the asking price.
Excellent service too. I made a blunder with my email address in Paypal info. Luca had this sorted in no time.
They say
The Modular Piano is a synthesized acoustic piano simulation created using classic subtractive synthesis on a modular environment. This is a very special piano as it was synthesized from scratch, note by note, and then imported into Kontakt to get more polyphony and use all the great features of this sampler.
This is NOT a sampled acoustic piano, so you will not find something similar into other piano libraries.