Lanzalover, Lenzetto (Evamist in the US) costs €10.77 and it contains 56 doses which each contain 1.53mg of oestrogen so slightly higher than Oestrogel.
I am using two pumps every day but split the dose by 12 hours. I've been using it for 8 weeks now and I really like it.
As for why it isn't available in the UK, probably on cost grounds as usual. The NHS seem to be very conservative and not very open to new forms of medication, it took them forever to agree to prescribe Oestrogel. The UK is practically the only place in world that doesn't licence Utrogestan to be used vaginally - something that nobody has ever been able to adequately explain.
As Daisydot said, Lenzetto is available in most parts of Europe. It has been licensed for use in all EU member states by the EMA who, ironically, are based in Canary Wharf although they will soon be relocating to Amsterdam.
I would say definitely give it a try.