
I eat low carb high fat non processed food - so no cheap options (though I always try and make sensible budget choices). Can't fill up on cheap stuff like bread, rice, potatoes, etc. There is a thread on here at the moment actually on how expensive it is to eat out when low-carbing.
All snacks need to be low carb - so that is nuts, cold meat and posh 70% choc (which in itself is a significant expense!

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My blood glucose is well enough controlled that I do not get medication for my T2, so as a non-medicated T2er, I get no help with prescription charges. I am on 2 non-D prescriptions, so that is £16.40/month
Most T2s are denied strips and a test meter. Too expensive for the NHS. Usually only those on the stronger meds such as gliclazide and insulin get testing equipment. I have chosen to use the SD Codefree and run intermittent Freestyle Libre sensor. Combined costs about £60-80 a month at the moment.
My surgery refuses to do 3 monthly HbA1cs, but will do one annually, so if I need them more often, I buy them privately (although I rarely do this). Last time I looked they were about £20 each.
The low carb thing means that holiday food is... um... interesting

We usually end up going to self catering cottages, which is kind of a mixed blessing. Yes, I get to eat what I like, but we are denied a LOT of the flexibility and food options people usually enjoy while on hol. We have stayed in hotels a few times over the last few years. Once I ended up eating meat and one veg at the carvery for 5 nights in a row.
I am not complaining - believe me, low carb high fat makes me feel better than I have for years - it is like getting a body transplant. But it does come with a cost... and not just money.
Ed. to add: And yes, thanks
@Oldvatr forgot to mention the supplements. They make a huge difference, so I am very happy to take them, but I guess they run to over £50 a month. But I don't think they are specifically a T2 thing, although there are several supplements that seem to have had a beneficial effect on my T2ness.