Thanks for the input. I didn't think getting eaten was an issue either, but I was at another forum earlier today where someone was discussing this issue and there were a couple people claiming to have years of experience with anglers, insisting that the frog and lion would try to eat each other.
I would prefer to buy it in person, but I'm just not sure where to go. I got a sargassum frog from Marine Depot about a year ago, after I couldn't find one in a store (at least not for what I would consider to be a reasonable price), and that turned out pretty well. I had it eating forzen foods within a week and it was perfectly healthy until it died after a long power outage. Maybe that good experience has artificially inflated my expectations for online ordering with this species, but I'm definitely keeping it as an option.