Last year, we ended up holding onto the currency that we'd still had left and used it towards this years trip. But we have 40 pounds left (I thought only 20, but I just found that my husband had another 20!) So I'd kind of like to exchange them for US currency. Our credit union doesn't do this, and I'm not sure it's worth a drive to the airport to do it. Any suggestions? I checked online, but I'm not even sure what keywords to use.