By Dana Dean
St. Louis (KSDK) -- Ever wonder when and why certain items go on sale?
NewsChannel 5's Dana Dean worked with a website called Deal News. They dug into their archives to find the best and worst deals for May.
Deals on HDTVs remain flat, which is why they make the list of worst things to buy this month. Though there are some exceptions, Deal News says you are better off waiting for early fall. Black Friday is the best time to buy.
Grills also make their list of the worst things to buy, for two months in a row. Deal News says the best buys come after July 4th.
And if you're the kind of person who is underwhelmed by holiday weekend sales, you shouldn't be disappointed this Memorial Day. Deal News says the holiday weekend is one of the first of the year where the sales are noteworthy. Look for the best sales of the year since January on apparel and home goods. Check for coupons that stack with existing sales.
Gym memberships also make the list of best things to buy and it all has to do with warm weather.
Lindsay Sakraida, of dealnews.com says, "Gyms need ways for people to actually sign on and come indoors for the rest of the year. It's a good time to look for special promotions. If you can try and haggle for a deal, try and knock off the registration fee or a discount the first few months of the membership."
Outdoor gear also makes the list of the best things to buy. May brings an influx of deals on camping and outdoor gear from major retailers. Look for hiking, fishing, and camping accessories for some of the best prices of the year.
May is also a good time to sleep easy. There are deep discounts on mattresses.
Sakraida said, "Every product has its own cycle. And typically mattress manufacturers release new models over the summer which means that it's a big bulky item. Department stores really need to move old stock. So we start to see really strong sales in May. Stores like Sears start to take up to 60% off and we will see that will get better throughout the month."
For more of the best and worst things to buy in May, visit Deal News' website.