Precisely - you can get the parts a lot cheaper by going straight to to the "parent" model, and lots of those aren't carried by either sub-brand anymore, like the onroad and rally models, though they are sold as HSP models.
The onroad is HSP #94122, "Flying Fish"
The others are:
Short course truck: 94155 "Rally Monster"
Rally Car: 94177 "Kutiger "
Monster truck: 94188
Buggy - 94166 "Baja"
94102, 94108, etc, with a "0" instead of a 1 in the second to last digit, have c-link suspension instead of pillow ball, which...
The old "pick 2 " dilemma - you can get a new, entry-level nitro for about that much, like an HSP onroad or monster truck. I've got one of each of their 1/10ths, and think they're perfectly serviceable bashers, but they'll need maintenance and parts sooner than other brands.
You can get a used...