premolded japanese tub

i hope to find a japanese soaking tub similar to what i have used in several tokyo hotels. it is preformed resin/plastic and includes a shower. roughly triangular,molded,, that i could replace the premolded shower/tub in my home. i do not need anything fancy, for example a wooden orfuro, nor would it fit. any ideas, or suggestions, or directions. i am 18 years and counting.