Hornady makes them, as does Speer. Available direct from the company but you will likely find them cheaper at any number of shooting accessory websites.
As to powders, I have not loaded lead hollowpoints as I carry factory ones in my 642. Nyclads, currently. However, with 158 grain semiwadcutters, I have had good luck with Unique* and 2400 (in the higher load range), SR4756 and HP38. I will leave it to you to research the powder amounts and be sure to work them up from safe levels.
My favorite for 38 loads these days.