So I bought several more ooths from yen as mentioned in my previous feedback post, and my second transaction was just as good, if not better, than the first! His shipping was prompt and meticulous; he gave me a great price on the ooths plus shipping (and even threw in a free ooth, in addition to an unadvertised discount!); his communication is fast, friendly, and super detailed/helpful; and he even wrote up a nice tutorial for me on creating artificial diapause conditions and hatching ooths via this method! Overall, it's been a pleasure to do business with Yen, so I hope he continues to offer interesting mantids in the future!
Just to update, after ~2 months of artificial diapause, then 3 more weeks of normal incubation, another one or the ooths I bought from Yen has started to hatch! They're so tiny that it may take another molt before I can positively ID the species, but they are definitely one of the Yersiniops (grasshopper mantids) species--thanks again, Yen!