Mass assign harvestapp.com invoice unit price input values.

gistfile1.js

var HOURLY_RATE = 9999.99; // lulz
var inputs = [].slice.call(document.querySelectorAll('.price'));

inputs.forEach(function (price) { 
    if (price.children[0]) {
        price.children[0].value = HOURLY_RATE;
    }
});