Link MarketPress Search to Membership User Level?

Hi there,

I have a store in which I offer discounts to members who have joined and paid a yearly fee.

I have specific pages where the products tagged with my different member levels appear.

However, when anyone searches using the search bar, all of the products appear at all levels of full-price and discount.

Is there a way to link the search to the user's logged-in status?

Or perhaps there's a better way to hide the discounted products from users who haven't joined a paying membership?

The site in question is: http://thefanconnectionstores.net/template

I'm using the Gridmarket theme.

Thanks!