What is the cheapest way to get 2nd phone number (via eSim or similar)?

I want to get a 2nd phone number for my smartphone. It has a sim in it already but can take a second one via eSim.

I want to get this number for work and receive calls on my phone alongside calls to my existing personal number.

I don't need data just the ability to accept calls.

The cheapest I can see is Lyca mobile which is £5 per month (£2.50 first month).

Anything cheaper as I don't need data, just the number and ability to accept calls?

Or could I get a "virtual number" and forward it to my main number?

Any ideas?