Sorting WP Auctions by date/price

Budget: Less than $100

I'm using this plugin called WP Auctions with the List plugin, and as you may have guessed, it is to display a list of auctions on a page much like eBay where users can bid on items. It is simple to set up. I just need to activate it and plug in the shortcode.The reason why I am having trouble is because I want users to be able to sort the list of auctions by price and date. This is not built into the plugin unfortunately.More details here: http://wordpress.stackexchange.com/questions/77197/sorting-wp-auctions-by-date-priceI set my budget at 'less than $100' but I am not sure how much work would go into something like this. If it costs more, I am open to it.