CGA320 CO2 Cylinder Refill Adapter Hose, CO2 Refill Station Connector Kit for Filling Blue Soda-maker Tank(CGA320 to TR21-4 Thread, Dual Valve with Gauge) (24 Inch)

I got 1 of these and its great, but you do need a 20lb tank. I'm not sure how the price compares to dry ice. https://www.amazon.com/dp/B08J6MXLG3?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1