A lot of the sales aren't really much of a sale. You likely didn't miss out on much. Most vendors on here will have similar sales at least once a month if there is a holiday, convention, anniversary, or some other random event to name the sale after.
Many of the vendors will have an inflated list price that is then marked down to give the appearance of a sale. Others seem to have similar sales so frequently that the sale price is basically the normal price and the list price is "We need time to catch up on orders, but if you really want to pay that much, then ok." A 25% off sale may sound nice, but when stuff is perpetually 20% off, it isn't as much of a deal as you would think.
It is also the middle of summer which isn't the best time to ship coral. Even if the vendor has a good packaging and DOA policies I wouldn't want to take the chance of everything showing up dead from the heat.
If you have a local club, check out their classifieds. People don't typically give their tanks as much attention in the summer, so there may not be as much for sale, but the ones that are selling probably aren't finding many buyers right now. I literally can't even give away the more "generic" stuff right now.