When I first started reloading I use to mold my own but I have found ou that I canbuy them cheaper than I can molded them many years ago. And with the high price of electric these days I can for sure save.
Probably right on cost if you figured in all expense. I don't have the time anymore but used a gas burner with my pot and enjoyed the time spent. Used almost exclusively wheel weights. It was fun and part of the overall reloading experience. About the only cost once you had the equipment was the gas cylinder, flux, and alox lube.
Now I just buy them by the 500 or 1k.