Here’s a bookmarklet to let you know what the average price of items shown in eBay was on each day of the week.

1. Drag eBayDayAvg to your address bar.
2. Navigate to a completed and sold page on eBay.
3. Click on the bookmarklet.

It’s probably best to run it on a page with the max results as high as possible, and try it on a few pages.  Also limit the page to display the most relevant items.

Here’s the code:

msg = '';
days = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
items = {0:[],1:[],2:[],3:[],4:[],5:[],6:[]};
$('.sresult ').each(function() {
 title = $(this).find('.lvtitle').text();
 if (!(title.includes('fault') || title.includes('spare') || title.includes('issue') || title.includes('damage'))){
 price = parseFloat($(this).find('.lvprice').text().replace('£', ''));
 date = new Date(Date.parse($(this).find('.timeleft').text() + ' ' + new Date().getFullYear()));
 items[date.getDay()].push(price);
 }
});
for(item in items) {
 if (items[item].length > 0) {
 msg += days[item] + ': ' + items[item].reduce(function(a, b){return a+b;}) / items[item].length + '\r\n'
 }
};
alert(msg)