The Dexcom G6 is available to us at a subscription cost of £159 per month, or available without signing up for 12 months at slightly more. Some people find they are able to restart sensors and bring the price down that way, it depends on how tolerant your body is to the sensor I think. T1s don't have to pay tax on this but I don't know whether you will be included in that - you will need to check, or hope someone comes along here that knows.
Alcohol wipes I get from Amazon but everything else has always been on a free prescription so I'm no help there I'm afraid.
If you are considering having supplies mailed to you bear in mind any insulin, and possibly other things, will need to be temperature controlled which would increase the price significantly I'd imagine.
Good luck
ps. Congratulations on being "Exceptionally talented"