How to hide your spending habits from retailers (so you don't get ripped off)

The reverse of this for my gain, I used a VPN for a location in Poland to purchase an online service which was €30 cheaper for an annual subscription. No difference in service.

Is this a thing in Europe? I rarely buy online, and the times I looked for prices they were the same across many devices. I’ve never saw I price different from what a friend told me they saw.