If you are planning to install a pretty large amount of tile flooring, cutting your own tiles will be a faster and possibly even cheaper route. You may need a machine like a wet saw to cut larger amounts of tile. Save money on this by renting one instead of purchasing one. If you can find the right deal, purchasing a used one may provide larger savings.
For smaller jobs, look for a used or rental standard wire cutter for tiles. This is a slower way to cut tiles, but you will save more on the flooring job.