I have noticed that the cost of modelling materials and associated items such as glues and paints have been increasing a lot lately.
You put in an order for various items to 'stock up' and the total can be surprisingly expensive. It is particularly noticeable with those things that you only buy occasionally.
As an example, not all that long ago I bought 500ml of Deluxe Eze Kote for under £12. Now it is £17.00 upwards. Brass and aluminium tube and styrene extrusions are similarly increasing.
Balsa wood is also up as the Chinese have bought up the market to use it for wind turbine blades.
I suppose that a combination of inflation and Brexit are responsible for most of the increases. Looks like us modellers may be reduced to returning to Blue Peter solutions involving Cornflake packets for hull construction. What goes around, comes around I guess.
At least I still have several rolls of gummed paper strip....

Colin