You can buy pink poinsettias at garden centers, local nurseries, and florist shops. You may also be able to order pink poinsettias online from retailers like Amazon or Etsy, which typically offer a wide selection of pink poinsettia plants and other holiday flowers and decorations. When looking for pink poinsettias to buy, it is important to consider the plant's growing requirements and how well it will fit in with your decor or garden style. Additionally, you may want to look for locally-sourced pink poinsettias or sustainably grown ones, as this can help minimize your environmental impact.