Cosmetic surgery and dentistry. We have a lot of cases of British people travelling to Turkey because the cost of surgery is much less. Then they end up severely damaged and have rely on the NHS to fix them up. Never cheap out on medical treatment.

food

Anything for my children's health or education

WiFi upgrades...

Food and drink.

Any serious healthcare procedure
Multifocal eyeglasses
Hiking shoes
Food
Computer
Camera
Headphones

Sadly, high price isn't the guarantee of the high quality.

These days , fewer and fewer things.

Rifle scopes

And paper towels...only Bounty and toilet paper...only Charmin for me:)

Bedding

Bath towels and headphones.

Pretty well anything where cost and quality are truly correlated and buying better would avoid replacement, improve satisfaction, etc .. to the extent the budget allows.

Sunglasses and a chainsaw!

Whatever's important to you 🤷

Underwear

Car and toilet paper

Alcohol and nothing else.

Mattresses