Where online can I find a good selection of hose barbs ...etc....

I drove around looking for a 1/2" to 3/8" hose barb so I could connect up my chiller. NO dice! Lowes and Home depot had nada!

Could someone point me in the right direction please!?

TXS

PS...no PH down at Walmart....sad night...came home empty handed!

I want to open a cool hydro store!!!!!!!!!!!!!!!!!!!!!! There are none around me!!!