I recently got a NEMA 14-50 receptacle installed in my garage so no longer need these items. All in pretty good condition, issues.
NEMA 14-30 Splitter, Dryer 14-30P Male Plug to (2) 14-30R Female Receptacle, Dryer 4-Prong 30 AMP 14-30 Y Adapter Cord (3 feet)
https://www.amazon.com/gp/product/B07CVSSYQL/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1
Paid $70, asking $45 shipped
NEMA 10-30P 3 Prong Dryer Rubber Extension Cord, 25-Feet
https://www.amazon.com/gp/product/B00SOYBTAE/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Paid $90, asking $60 shipped
NEMA 10-30P 30Amp 3 Prong Dryer Extension Cord
https://www.amazon.com/gp/product/B06VVJVZLQ/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1
Paid $93, asking $60 shipped
NEMA 14-30 Splitter, Dryer 14-30P Male Plug to (2) 14-30R Female Receptacle, Dryer 4-Prong 30 AMP 14-30 Y Adapter Cord (3 feet)
https://www.amazon.com/gp/product/B07CVSSYQL/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1
Paid $70, asking $45 shipped
NEMA 10-30P 3 Prong Dryer Rubber Extension Cord, 25-Feet
https://www.amazon.com/gp/product/B00SOYBTAE/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Paid $90, asking $60 shipped
NEMA 10-30P 30Amp 3 Prong Dryer Extension Cord
https://www.amazon.com/gp/product/B06VVJVZLQ/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1
Paid $93, asking $60 shipped