Sometimes the items arrive very fast and sometime it takes a week or more. I'm sure it depends on their deliveries from Wright (they are located in Ohio also like Wright). But they always seem to have everything.
I've been gearing up to sell Wright tools primarily for local shops near me though. I always ship the same day ordered unless late in the day. Different shipping times is probably due to not having some items, reordering from Wright, while I only post what I have on hand. Epstein's prices are hard to beat.
I seem to recall we had a post about just this same question but finding it is a challenge, The how to buy looks to very promising along with Epsteins.