Egding
Hi. We have used treated pine sleepers, with a 75x75mm x 12" long post at each "butt joint". You can buy special screws that justscrew straight in, and last for yonks. If you get the right treated pine, it lasts for ages in the ground (I think its called "H4" or something like that - ask the timber guy).
Fairly cheap if you get a reasonable price on the sleepers (ask for seconds or whatever...), and fast, easy tough etc.
I did my home this way as well - looks good.