Shabbat expenses return

Is there an obligation to make an effort to do my Shabbat shopping in a cheaper store? To be more specific: we have a neighborhood store next to our house. Going to a large supermarket, which is some distance away, is a big bother for us for a number of reasons. Can we do our Shabbat shopping in the neighborhood store and rely on the guarantee that Shabbat expenses are reimbursed (by Hashem)? Or maybe we are obligated to go to the trouble of searching for lower prices, even though that involves some hassle? Thank you for your response  

Money that you spend in your neighborhood store next to your house is considered Shabbat expense that is reimbursed.