To answer your question to the best of my ability..yes and no.
Some pet stores can be great at pets and their care. They know how they should be kept, the type of substrate that is proper, the food requirements, everything. And then you've got some stores that are after the almighty $$ and couldn't care less if the snake in question ate hoppy toads, they're just there to make a buck. *cough* Petco *cough*
Most breeders on here are reputable and honest, and will provide you with good healthy stock to the best of their ability. But also on that end, unless you have one within driving distance of you, you would have to pay for the shipping fee of the animal you ordered. For most of us, that isn't a problem. It's usually $35-$50 extra on top of the price of the animal(s).
Before you buy, check out the local stores and do a mental checklist of how you see them taking care of their animals.
An example that I do when I go are:
1. Are the cages of all the animals that are on display clean and free from piled up feces?
2. Do you see any obviously deceased animals?
3. Do the animals seem to have good weight and skin/coat condition to them?
4. Question the employees on the care of animals and see how they answer. If they don't know their elbow from a bag of hammers, that's a big tip-off.
5. Do you see any parasites on the animals? Mites are tiny red or brown specks that look like pepper, ticks are obvious.
6. And generally, most places I've gone to that don't seem to take care of their fish...usually aren't good for anything else either. Like if several tanks are marked with a black X on the tank, not a good sign. And if you see floating dead and cannibalized fish left in the tanks, also not good. I'm sure this correlation isn't always the case, but in most of the petstores I've ever been in...if the fish look atrocious, everything else is bad too.
I hope that helps you a little. If you have any more questions, feel free to post them. =)