Need extension to bring product COST into Opencart

I'm a newbie - just getting started with OC and am moving my store from another platform.

I want to be able to set up pricing formulas based on marking up from MY COST.

Example: If cost is 0 to $9.99, price = (Cost x 3) + $5.00.
If cost is $10.00 to $24.99, price = (Cost x 3)
And so on.

This will require both some sort of bulk pricing matrix AND an extension to integrate with Quickbooks which will pull in my cost for the products.

Any advice on extensions to do this appreciated.