Plain white ceramic wall tiles (just a small amount) (Danesmoor S45)

Looking for some plain white (or off white) ceramic walls tiles to fill a gap in kitchen tiling where tiles had to be removed to repair pipes behind. Area is 40 cm wide, 25 cm high - but plan to paint all the tiles anyway, so most plain ones will do if they can be cut, including mosaic style. Buying plain white tiles, and a small quantity seems impossible these days!