We purchased our window boxes several years ago online and I cannot remember where we got them. They are 30″ wide, white vinyl. My husband loves the way that they are installed. There are permanent brackets on the house and the boxes slide into place easily onto the brackets. I love doing different things in the boxes each year and have not duplicated yet. Some have been better than others for sure! Some plants seem to want to take over the entire box so I take care to keep the box hoarders cut back and this also helps the keep the boxes looking the same. I always take into consideration that the boxes face west, so whatever I put in them has to love full sun. One of my methods of choosing what to put in them is to always have a filler, spiller, and a thriller! I also like to decorate them for other seasons such as Halloween, fall, and Christmas once the summer flowers are gone.