Plumerias are a long-term project. If cost is an issue, try growing them from seed. Fresh seeds can be found inexpensively on co-ops. I'm in year 3 with my plumeria seedlings. They make great gifts for gardener friends, and it is an event when they bloom after years of waiting. If you are less patient, buy sticks, root them, and it still will take a couple of years. In most parts of the United States, bring them indoors in winter, put them in the garage or basement, and only water them monthly. Then repot them in spring, plunge the pot in soil, and let it take off for the summer months.