I've had 3 livestock orders, 1 live sand and 1 dry goods order since I started ordering around 3 months ago. All have arrived in great shape! I am planning another order within a month. By then I will have gotten my tank up to my desired stocking level so will probably not order as frequently.
I only order 1-2 fish at a time. I don't mind the $75 minimum as it gives me an opportunity to experiment with different invertebrates and corals. The fish go into the QT for 3 weeks so I don't feel I am introducing too much life at once. I think I have read that orders less then $75 are no longer accepted.