Years ago, I tried all sorts, prices printed on the leaflets, prices hand written as I deliver them, special offers blah blah blah.
To be honest, it didn't really make any difference either way.
Now, I just stick to a well designed, simple, clear message, a picture of me and the van, a short well written description of what I offer, nice and simple. My return is usually 4 per 1,000 (that's actual customers not enquiries).
For next year I shall only be targeting bungalows or 'easy small houses', as I'm 58 now. so I'll see how my leaflet performs there.