part has been discontinued since October 2011. if you want NOS that is not dry rotted, the web has set pricing at $150 to $225 each as you've seen. even the "Y" connector fetches $30 to $50 now. prices started skywards in 2016 when the "X" cars began claiming 6 figures.
have your original hose and plastic pieces? get some new 5/32" and 7/32" hose and make a new assembly. if you're a sticker for GM hose, it's GM6148-M ABG hose in those sizes. be prepared to order a pretty good size roll from your local dealer.
need about 20 inches of 7/32 and about 1-3/8 inches of 5/32 hose. get it from a brick and mortar store locally and be done with it - by the foot.