I've used many places including LiveAquaria.com, thatpetplace.com, battlecorals.com, pacificeastaquaculture.com just to name a few. I also have a couple of LFS in CA that I get fish from. It's best to get a picture or video of the livestock you're ordering.
I think it's better for you to find what you're looking for, ask the forum about that place or do a little search on that place before you place the order.
For the most part, overnight shipment of livestock is not a problem. I've received boxes from other members all over the country and as long as they pack it good and UPS does their job, it's not a problem.
Recently, with the shortage of workers, UPS has been hit or miss. I've have had packages came in online, 24hrs delay and even 96hrs delay. 48hrs is usually okay if they pack it good. But nothing will survive a 96hr shipping.