Buying a new or 2019/2018 vehicle

My husband and I are trying to find the best way to buy a new or preferably fairly new vehicle. We are used to our Olds. Silhouette, however they don’t make them anymore. Does anyone know the best way to find the now hard to find minivan at the very best price? We don’t want an SUV, to small. Need something with room for normal size people and luggage. Any help greatly appreciated. Thanks.