The listing, Christmas Cactus cutting (1) - blooms with a pink flower has ended.
Picture one is the "mother" plant. Picture two is the cutting you will receive. It will be sent bare root with wet toweling and packaged to protect it on its travels to you.
Keep the plant in a well-lit location (like near a window)-bright, indirect light. Keep away from drafts, heat vents, fireplaces or other sources of hot air. It likes house temps of 60* and above. Provide a source of humidity if you live in a dry environment. Put a tray of water next to the plant so that the water evaporates and provides humidity, or place the pot on a waterproof saucer that is filled with gravel and halfway filled with water. Do not over-water or underwater it: Keep soil evenly moist. Less water is better than too much water. When watering, thoroughly water the plant. Before attempting to water the plant again, check to see that the top inch of soil has dried thoroughly first. Mist leaves as well as watering the soil.
Never water the top of the plant. Instead find a container that has many holes in its bottom. Some of the cheap nursery planters will work well. Pair this planter with a planter that will hold water and allow the basket to fit down into. Place a few medium sized rocks into the bottom so that the basket container will be held about an inch above the bottom. Use a combination of 3 parts potting soil to one part sand for the potting medium. Finally pour about two inches of room temp water into the outer container and set the basket container inside. After about twelve hours pour out any remaining water. Repeat this as often as the plant needs water, it will vary based on your home's condition.
The Christmas Cactus flowers best when it's pot-bound. Provide a soil that's well-drained with good aeration (e.g. one part potting soil, two parts peat moss or compost, and one part sharp sand or perlite).