
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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Bestway alpinelite 7.6r 600g £35 does me well
That's odd, it's on Amazon
Half a year delivery time though, I’m sure that’s why it’s half price on Amazon, still a good mat for the price but it’s about £60 with anyone who has it in stock
Bestway Alpine for the money nothing else comes close. https://amzn.eu/d/gyFl8LH
Sleeping mat, bestway on amazon is around £40...search this sub for info... Damn good for the money. https://amzn.eu/d/1Dtg4Gj
I tried recently their AlpineLite (wide version), it worked well and it was quite comfortable.
I am a side sleeper too and I have used both the Bestway Alpinelite (wide version) and the Simond MT500 (large). I prefer the Bestway, it's much more comfortable for me. The downside to it is that the Bestway is heavier (760 grams) compared to Simond's 510 grams, which is normal given the higher R rating of the B. Alpinelite.
The Bestway Alpinelite is a great budget option if you can get one - R7.6, 664g, £40

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series