Boyajian Pure Lemon Oil - anything as good as?

[oilandwater]

I’m looking for a strong lemon oil for cakes lemon curd etc. I’ve come across this, the reviews are good, but I just wondered if anyone knows of an equivalent, this is £20 for 100mls.
I use fresh lemons but to really get a strong tang I find only an oil can do this. Too many lemons alter the consistency of some recipes.