where to get co2 containers from in england?

hi anyone know where to get dry ice in uk, in small amounts? if so let me know im desperate for more humidity! 36-39 when light on 8+ weeks now started flowering, 250watt hps 12/12 ny ideas? have 3 fans in total they r computer fans 1 is on the plant itself, the other is in the vent at the bo9ttom and the other is in the top outake vent .

dry ice? why not just buy a humidifier from argos £25 if ya wana raise humidity.

dry ice is expensive. buy a humidifier or use one of these. this is what i use.

40% is fine during flowering. I wouldnt worry about it.

what is that D Gotti and where do i get it from?

your humidity is perfect. in flowering i actually prefer less humidity than that. your humidity does not need adjusting imo but i agree with previous posts suggesting a humidifier instead of dry ice if you are going to adjust.

its a fish tank heater in a gallon of water.