Motor oil leak

Ford f150,2005 41k, v6
not so much a repair question but more of how much is this gonna cost question. The oil gauge on the truck was going from low and popping back up to mid full. Then about 4 days later I heard a clicking noise. Turns out there's an oil leak. Somewhere. We went back to the place where we got an oil change a few weeks ago. It's not the cap at the bottom, but they did say it was low on oil and that there's a leak somewhere. We've scheduled to take it in to the dealership 4 days from now. Any ideas on where and how much it will cost to repair it? My husband seems to think that it may cost up to 5k to fix, he's freaking out.I know it could be as simple as a break in hose somewhere or maybe much more serious. Also, is it okay to drive it as long as we keep on adding oil every time we drive it? Thanks.