PORCELAIN TILES and any floor tiles are a nusiance if they do get cracked. This happened to me on my kitchen floor - ordinary terracotta floor tiles but luckily enough, I had kept a few spares. Maybe post a pic of it and you maybe lucky to find a punter who would have something similar. If I had my way, I would NOT put down floor tiles because at some stage, they DO get cracked, damaged and even in my experience, dealing with builders/developers in my job, newly built houses down the road, usually 8-10 years, with shifting and movement, some floor and wall tiles do become victims of movement! Ain't no easy way!!
Good luck