Need betting competition script/website

Hi, it would be great if i could hire a freelancer to make me a script something like this:
www.betroof.com
www.betshoot.com
www.lakalovica.com
...

Or something like that, where a bettor place a pick and then i just decide if pick is correct or wrong and he earns or lose points depended on the odds and stake he have made.

I wish this to be possible to add into wordpressblog or something like that...

Anyway please let me know how much will this cost.
Im looking for cheapest service possible.

we can make it its php and java based ! but will be costly !