It depends what you want it for and how far you can travel. There are lots of older people who have large overgrown gardens. A friend garden s 5 acres for an elderly neighbour, which means basically mowing the grass and sorting a farmer out to cut the field, which she has been paid for the last 20 years.
So I would set up a small reliable business which could pay for your kit, and can be used as claimable allowances for tax purpose's, pick an area where there are properties with large gardens and do some networking. Older people know everyone and as with everything its often who you know that gets you things.