I know that feeling, Wow. I do hope for your sake the courier isn’t bloody Yodel. Good luck.
I have bought:
A couple of foam sitmats (I did have one before but I think it blew away when we were camped at the foot of Snowdon as it did not come back with us).
Some Actual Jetboil fuel (I’ve always just used the Coleman canisters because they were easier to find). Will be interesting to see if it makes any difference.
A Victorinox ‘Camper’ tool. On our last camping trip our wine/beer was limited to that which had a screw cap/pull tab which won’t do. I’m sure I will find all sorts of uses for the other bits on it.
Some windproof matches, to avoid the frustrating time we had trying to make FIRE on a breezy evening in Wales (we did eventually manage, on the penultimate match from our box of normal cheap matches, but there were a tense few moments beforehand).
Some lightweight guylines because I’ve lost one of the tent’s originals. Flouro because having a fluffy dog tethered outside the tent sometimes attracts small children and they tend to trip over the guylines in their haste to come and make a fuss of her.