average ebay price

average-price.js

var getItems = () => Array.from(document.querySelectorAll('.srp-river-results .s-item__price'));  
var getPrices = () => getItems().map((item) => parseFloat((item.textContent.match(/\d+.\d+/)[0]))); 
var sum = () => getPrices().reduce((a, b) => b + a, 0 );  
var getAvg = () => sum() / getPrices().length;  
console.log(getAvg().toFixed(2));

var digits = new RegExp('\d+.\d+')
var getItems = () => Array.from(document.querySelectorAll('.srp-river-results .s-item__price'))

var getPrices = () => getItems().map((item) => parseFloat(item.innerText.match(digits)[0]))

var sum = () => getPrices().reduce((a, b) => b + a, 0 )

var getAvg = () => sum() / getPrices().length

console.log(getAvg().toFixed(2))

I used aalvarado's code but it was giving me an error. I've updated it now.