I normally just call S&W as they are the cheapest and have been real good in the past regarding shipping. Don't call S&W right now though, they are having a nuclear meltdown due to issues with new software for selling parts and apparel. I have 3 orders in with them for about 2-3 months and have been told it will be another 4 weeks,
just ridiculous!
Go with Wolff or you can check Midwayusa. I only use Numrich if I have to, as they are way overpriced. Good news is you still have options.