This site is just standard HTML, CSS (Nothing special here), PHP/MySQL and a bit of AJAX here and there. I solely developed this site - I think that is something to be proud of anyway.
Design needs to be simple for all ages, attractive and easy to use. It's a lot harder than you think to have good usability on a site this big!!! Those who have done something similar to this from scratch will know what I am talking about.
There is not a single bit of 'off the shelf' work on the its4sale website.
Originally I had friends/family wanting to post items online... So I developed this originally for church's and community's to advertise for free. So, why not let everyone do it for free? And there you have it.