A sample just gives the indication of the colour and really is no reflection of the nuances of the complete tile be it whatever size
Then you have 2 options
Showrooming - Wikipedia - https://en.wikipedia.org/wiki/Showrooming
or
Research online, purchase offline - Wikipedia - https://en.wikipedia.org/wiki/Research_online,_purchase_offline
Then you have 2 options
Showrooming - Wikipedia - https://en.wikipedia.org/wiki/Showrooming
or
Research online, purchase offline - Wikipedia - https://en.wikipedia.org/wiki/Research_online,_purchase_offline