Free shipping based on multiple price ranges?

[geodave]

Hello,
we're offering a discount program similar to the following:

Purchase over $100, get 5% off.
Purchase over $250, get 5% off and free ground shipping.
Purchase over $500, get 10% off.
Purchase over $1000, get 10% off and free ground shipping.

I have the percentage discounts set up just fine, but is there any way to set up multiple price ranges at which the free shipping option kicks in?

Is there a specific place I can try and write a function that will look at the final shopping cart price and depending on what range it falls into, enable the free ground shipping option?

Or is there possibly a module that I just haven't found?

All the best, you guys are aces.

[Ajeh]

You could customize the Flat Rate flat shipping module to display as Free Shipping Ground and set the charge to 0.00 ...

Then, customize it to only show when:
(total >= 250 and total <= 500) or total >= 1000