Where do you prefer to go shopping when you are on holidays? Why?
I prefer to go to stores where I find the quality of the goods wherever it is the place!
This is good! There are two changes you should make:
1) Instead of the quality of the goods you should say high-quality goods, because you're not shopping for "quality," you're shopping for "goods."
2) Instead of wherever it is the place you should say wherever the place is so that you don't end up with two main verbs in the sentence.
'I prefer to go to stores selling high quality goods, wherever the place is.'