Eco bubble bath

[Consideringparttime]

I'm trying to be more eco friendly. I have 2 lovely baths a week, and I love bubble bath but I'm getting sick of all the plastic bottles.
I use a bar soap in the shower already. I'd like recommendations for lovely bubble bath in a glass bottle . Please don't suggest oils or bath bombs as its the bubbles I love. What can I do?

Have you considered solid bubble bath bars?

No I've never heard of these! Are they good.?

I used to use the Lush ones which were definitely very bubbly, and Google suggests there's lots more options now.