Plugin for "Search by category" on my Website?

Hi, I am wondering if there is a plug-in or some other way to get a search function on my website similar to the one on the left at this link: http://penncycle.com/product-list/bikes-1000/road-1001/sport-performance-1002/

I basically want to have a bunch of categories on my website, like monthly revenue, time spent, etc, with options under each so people can check what they want under each category and posts with matching specs will show appear.

I apologize if this is a question that is easy…I’ve been searching for 2-3 hours now all the different plugins and just am not seeing anything close.

Thanks for your help.