Free for taking three 1/2" 304 SS Female T’s and one coupler. These came off my inline thermometer/oxygenator rig:
They are pretty much like these:
https://www.amazon.com/Stainless-Steel-Fitting-Class-Female/dp/B003GSKXFK/ref=asc_df_B003GSKXFK
I upgraded to some much nicer ones made by Parker that are 316.
Just pay for the postage, and if so inclined toss in enough for a micro-beer.