Derelict land, without (today) possibility for planning for a house can still be found relatively ’cheaply’.
I did that, between the villages of Mayfield and Five Ashes in E. Sussex.
If you know the area you know the horrendous prices of land and houses.
As it was covered in bramble, that plant horses die from and very wet, I got it for a song.
Took a lot of work to get right. It was fun, almost as fun as restoring an old barn find vehicle.
In the near future I think that prices of such land may go down in UK..
Could it be worth to check with the surrounding councils if they have something for sale, or whatever departement of the state?
Bank loan, loan from parents, working overtime, cutting out alcohol, stopping going out, all are feasible ways to get money.
Crowdfunding maybe too if you do not mind the principle.