It's best to check with individuals stores and websites for the best sales.
There is no specific calendar day for sales. Every store has its own sale time. Some on holidays and some after holidays. Others are random. You can call specific stores and ask when the plan for their sales
Sales are not specifically oriented yo days of the week. Holiday sales, pre and post holiday sales being the exception. Would encourage you to contact specific stored of interest. Or ck their websites..
Sales will depend on the stores. You can always check out the stores website for sales
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