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Apparel, home goods, school supplies
"September is all about the end of summer, so anything seasonal is going to be on clearance," says Glaser.
Look for rock-bottom discounts on summer clothes -- everything from clothing and swimwear to shoes and accessories -- up to 50% off, says Perez. And on Labor Day weekend, look for additional cuts of 20% to 30% for deals that amount to 70% to 80% off original prices, she says.
You'll also find good deals on summer home goods --from grills and patio furniture to pillows. Look for discounts of around 40%, says Glaser.
September is also when you'll find the last of the 1-cent and 10-cent deals on school supplies at the big office supply chains, she says. "The deals start to wind down after Labor Day."
Some clothing and camping retailers will also have sales on back-to-school clothes and backpacks, says Perez.
And if you or the student in your life needs a laptop, you might be able to find a deal. It's "the tail end of back-to-school season and inventory will be more limited, but the discounts justify giving it a look," says Glaser. With $300 to $500 devices, "you can expect $100 off," he says.