I have a couple. I have the Zen Soto which was around £50 a few years ago and I also got a really good one from Amazon for £15, they no longer stock it but I’ve linked another one below.Which steam diffuser do you have? I was looking at the Neom one but it’s quite expensive!
I really like the Neal’s Yards blends and they have lots of different ones, if you have a shop near you they have testers that you can sniff before buying.
Amazon product