I have too much fun shooting my 686's for a woman who doesn't reload, so price is key for plinking rounds.
I wait for Cabela's store brand "Herters" .357 158gr FMJ & .38SPL. 158gr FMJ to go on double sale + rebate.
Occasionally, they run 20% off sales simultaneously with 20% for their credit card holders. Combining those sales with the rebate for using the credit card, gets me the .38's for $14 and .357's for $16.
I order by mail, for store pickup, so that I get all I want, regardless of what's in stock locally.