Where do I get big replacement tiles from?

[OM2]

We need to have a new shower fitted.
The shower is built in, so the bathroom tiles have to be broken open.

Just wondering where the best place would be to get the tiles?
They tiles are just white ones.

The measurements are: 24.6cm width x 34.4cm height.
Is this a standard height?

Can you get tiles made to order?
I'm guessing you can if you pay enough! But... looking to do on a small budget.

Not sure what could be done if we can't get replacement tiles.

Thanks.

 

[just pumps]

Could fit tiles that are totally different rather than match. A columm of tiles from top to bottom say two rows wide becomes a contrast.

 

[OM2]

I'm not sure how that would look
Might look odd
Is there absolutely nowhere I can get tiles that measure 24.6cm x 34.4cm?

 

[IJWS15]

Best place to try is where the original tiles were bought from.

 

[mattylad]

OM2 - have you tried tile shops?