Plugin/Theme Required – Calculated Filter

Hi,

Does anyone know of a plugin or theme that will allow me to have listings/posts with a cost attached then in the front end of the site allow users to search by figure and then the posts filter to add up to the figure they have searched.

A example of how this would work is: say the figure was a budget and the underlying listings/posts were services with costs. If I were to type in the budget £100, the posts would filter to add up to £100 e.g. 1st post = £50 logo, 2nd post = £20 business cards, 3rd post = £30 flyer design. This is just an example. I would basically like the amount searched to filter the posts underneath.

I’m not sure what to search for in Google to try and find the right product, if there is a product out there that can do this, I’m thinking it might be

Is anyone aware of anything that can help me?

Thanks
James