I should try and explain a bit, due to some of the resonses I am getting...

I'm not Frustrated, I'm exhaused!

I don't sleep, because DS sometimes gets out of be and goes for a wander, he can open the dead lock door (I refuse to take out the key in case we have a fire or something)
I have peed my pants before, because DS was outside and I could NOT run in and go to the loo really quickly.
I cannot answer the phone at all, which makes running the business extremely difficult, because I fear for his life.
We have a 6ft high fence and he still climbs it, I have watched him before... it takes him about 30 seconds to get over it... and he is not even 3 yet!
DS is very strong, I have put those child safety latches on EVERYTHING, and he has them ripped off in about 4-5 days

We live on a station, which for the city people here who have never been on a farm, IT'S DANGEROUS!

From our house- there are 2 deep wells within a 50 metre radius of the house - they are covered over, but I sure as hell wouldn't stand on one!
I killed 4 snakes yesterday... not your garden variety snakes, but 3 Taipans and 1 Brown!
added to that we are 4 hours from the nearest hospital, so if something goes bad, it tend to go really bad out here!

So for me to be asking about putting an electric fence up, I AM REALLY AT THE END!

I DON'T want to wake up one morning and find William floating in the nearest well..
I DON'T want him to be bitten by a snake in an area I CANNOT control, or CANNOT see, so he can be given antivenom.
I DON'T want a DEAD KID.

I know how bad it must sound to ask for peoples opinions on this... but honestly, I don't know what else to do!