Some of my most durable bags are from H&M (do you have H&M in the US?). If I go to H&M and spot a bag that is made of nice leather, i get it .
I have a brown suede hobo from them which is 10 years old and looks great. And a camel buttery soft leather shoulder bag with a front pocket and buckles that looks like a million! Everyone compliments on it and asks where its from. :tispy: I also bought my sister a beautiful coral bag from Zara (does Zara exists where you are? a Spanish department store) that is made of very thick leather. None of these bags exceeded 100 $ and they'll last for a lifetime. I also have vintage bags I paid 10 $, but they are beautiful leather and good quality.
So, no, i am definitely not limited to Balenciagas or Hermes. It is more a matter of spotting quality and style wherever it is.