It's not that hard to find reputable breeders selling guaranteed hets and standing by them. Doing just a tiny bit of homework as a buyer goes a long ways towards not losing out on valuable time growing up these animals.

I think it's also worth mentioning that reputation isn't always proportional to years in the hobby. There are a lot relatively new breeders who have just as much (if not more) to lose by having their hets not prove out as such.

Best of luck!