Mattress Firm South Bay Plaza logo

Mattress Firm South Bay Plaza

Mattress Firm

Dorchester, MA

4.7(716 reviews)
9 active offers6 store perks
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About Mattress Firm

Mattress Firm offers a wide selection of mattresses from top brands, including Tempur-Pedic, Purple, Sealy, and Sleepy's. They provide various promotions, such as the Memorial Day Sale with up to 60% off, and offer financing options like 0% interest with equal monthly payments on qualifying purchases. Customers can enjoy free and fast delivery, a low price guarantee, and a 120-night sleep trial. All mattresses are assembled in the U.S.

Current Promotions
Last updated Oct 23, 2026

Current homepage sales include up to $700 off, a free adjustable base with select mattresses, select price-point and bundle offers, clearance mattresses up to 70% off, $300 instant gifts, and an extra 15% off qualifying purchases.

  • Black Friday Sale: Save up to $700Expires: 2026-12-08Savings vary by product and model; valid only on models indicated; product selection may vary by store.
  • Free adjustable base with select mattressesSelect mattresses.
  • Queen beds under $500Queen beds.
  • Sleepy's By Sealy Spring Luna Euro Top mattress and adjustable base bundle
  • Any size for $249.99 on select mattressesSelect mattresses.
  • Up to 70% off select clearance mattressesSelect clearance mattresses; while supplies last.
  • $300 instant gift toward a total sleep solution
  • $300 instant gift on select Purple mattressesSelect Purple mattresses.
  • Get an extra 15% offQualifying purchase; available online or in-store.
Purchase Incentives
  • 0% interest with 72 equal monthly paymentsQualifying purchases with Mattress Firm credit card; subject to credit approval. For 60- and 72-month in-store purchases, taxes and delivery fees must be paid upfront.
  • Free and fast delivery
  • Free & Fast Delivery
  • Financing & Leasing
  • Low Price Guarantee
  • 120 Night Sleep Trial
Mattress Selection

Brands

Tempur-Pedic
Purple
Sealy
Sleepy's

Ideal for

teens
growing children
adults

Technology

memory foam
hybrid
innerspring

Assortment

Box Springs & Frames
Adjustable Bed Bases
Bedding
Furniture & More

Price range

$
$$
$$$
$$$$

Estimated price positioning for this store

What Your Neighbors Say

Real Google reviews from nearby shoppers

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Average rating 4.7 · 716 reviews

Last updated Dec 11, 2025

Wendy Lima· 5★ · a week ago

Wilmer was super helpful and very knowledgeable. He was patient and presented every option available to help us purchase 4 new mattress for our new home! Thank you Wilmer you deserve more than 5 stars.

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LeeJMc6· 5★ · 2 months ago

Wilmer did an excellent job of understanding our needs. He was extremely knowledgeable and was great at explaining the pros & cons between the products. Very easy to deal with & highly recommend.

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Mark· 5★ · 3 months ago

Ex and Wilmer gave me a warm and polite greeting as soon as I walked into the store, which made a great first impression. After I explained to Ex what I was looking for in a mattress, he immediately began guiding me through the options that best suited my needs and stayed within my budget. He was knowledgeable, patient, and made the entire process smooth and stress-free. Wilmer also checked in to ensure everything was going well, which I appreciated. I would definitely recommend this store to a friend who is also looking to purchase a new mattress soon.

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josh pafundi· 5★ · 4 months ago

I went in earlier this week and put a deposit down on a mattress to reserve at sale price. In person they were super nice. Ended up changing my mind as the mattress was realistically a little out of budget as a collage student. Called and got my refund in literally 2 minutes, no questions or hassle at all. Wouldn't hesitate to come back in a few years when I am ready to buy a more long term mattress.

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Everett Roscoe· 5★ · 4 months ago

We had a great experience at Mattress Firm today thanks to Wilmer. He was friendly, knowledgeable, and patient while helping us choose the perfect Sealy mattress. He made the whole process easy and stress-free, and we never felt rushed or pressured. Highly recommend working with Wilmer if you’re looking for great service and a smooth buying experience!

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