Check into a Local Dealer for one of the national brands - such as the "Invisible Fence Co" -
look in the Yellow Pages for one near you and ask for an estimate.

SOME of them offer good prices; and they ALL provide installation of the system -
NOT for "free" - but they should be "reasonable". And they offer "training" -
mostly for YOU;
but they help with the dog if you're having trouble.

Once you meet the Dealer- try wheelin & dealin ... unless they have a zillion pending orders,
you may get lucky with a good price. Ask if they'd just install your wire -
or rent you their wire plow.

Also check at PetsMart - they sell some fence systems, too.

/s/ Phred