Best Mattress Gap Filler Deals Online in the UK (10 Deals Found)

Last Updated - 19/06/2026 Sort By:

Best Choice
RAINBOW

New
RAINBOW High Density Fo.am Gap Filler for Headboard, Sofa, Bed, Mattress Extender, Fo.am Pillar, Fo.am Cuboid, Fo.am Sti
Upholstery Foam Seamless Sleep Solution: Our bed gap filler effortlessly bridges the annoying space between mattresses,

£14.49
Best Value
TokSay

New
TokSay (54"x10"x6" Double Size Bed Wedge Pillow for Headboard,Bed Gap Filler Between Mattress and Headboard, Adjustable
Mattress Gap Filler: Are you still annoyed that the pillow falls under the bed because the gap is too big? Choose our sl

£28.99
David & Amaya

New
David & Amaya High-Density Foam Mattress Extender – Sofa Bed Gap Filler, Rectangular Bolster Support Pillow, Armrest or
✔️ Seamless Sleep Solution: Enjoy uninterrupted rest with our premium foam bed gap filler. It effortlessly bridges the s

£14.99
TokSay

New
TokSay (60"x10"x6" King Bed Wedge Pillow for Headboard,Bed Gap Filler Between Mattress and Headboard, Adjustable High-De
Mattress Gap Filler: Are you still annoyed that the pillow falls under the bed because the gap is too big? Choose our sl

£32.99
RAINBOW

New
RAINBOW High Density Fo.am Gap Filler for Headboard, Sofa, Bed, Mattress Extender, Fo.am Pillar, Fo.am Cuboid, Fo.am Sti
Upholstery Foam Seamless Sleep Solution: Our bed gap filler effortlessly bridges the annoying space between mattresses,

£12.75
RAINBOW

New
High Density Gap Filler for Sofa Bed, Mattress Extender Foam Rectangle Bolster Support Pillow Armrest Cushion Bed Gap Fi
𝐅𝐨𝐚𝐦 𝐂𝐫𝐚𝐟𝐭 𝐒𝐞𝐚𝐦𝐥𝐞𝐬𝐬 𝐒𝐥𝐞𝐞𝐩 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧: Our bed gap filler effortlessly bridges the annoying s

£9.99
40% Off
Brillars

New
Brillars High Density Foam Bed Gap Filler for Mattress & Headboard – Sofa Bed Extender, Rectangle Bolster Support Pillow
1. Seamless Sleep Solution – Eliminate the uncomfortable gap between split mattresses with our high-density foam bed gap

£11.99 £19.99
RAINBOW

New
High Density Gap Filler for Sofa Bed, Mattress Extender Foam Rectangle Bolster Support Pillow Armrest Cushion Bed Gap Fi
𝐅𝐨𝐚𝐦 𝐂𝐫𝐚𝐟𝐭 𝐒𝐞𝐚𝐦𝐥𝐞𝐬𝐬 𝐒𝐥𝐞𝐞𝐩 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧: Our bed gap filler effortlessly bridges the annoying s

£14.99
Dulce Lino

New
Dulce Lino Foam Bed Wedge Pillow for Filling Gap between Bed and Mattress Sleeping Function with Removable cover. (SINGL
Support Posture: It helps improve posture by filling the space between the bed and body, which can be particularly usefu

£14.99
Dulce Lino

Used
Dulce Lino Foam Bed Wedge Pillow for Filling Gap between Bed and Mattress Sleeping Function with Removable cover. (SINGL
Support Posture: It helps improve posture by filling the space between the bed and body, which can be particularly usefu

£13.99

10 Mattress Gap Filler deals are available from: Amazon stores, starting from £9.99.
The biggest discount we found is 40% on Brillars High Density Foam Bed Gap Filler for Mattress & Headboard – Sofa Bed Extender, Rectangle Bolster Support Pillow, Armrest Cushion – Firm Foam Only (Grey, 120x10x5cm) at Amazon.
The lowest price we found is £9.99 while the highest is £32.99.
Prices for the best Mattress Gap Filler deals average at £17.02.
Last updated on June 19, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Mattress Gap Filler.