And what size of it should I be looking for? The 4x4 Tegaderm looks huge but the 2 3/8 x 2 3/4 looks too small. Can the 4x4 be cut smaller? I know the bioclusive or tegaderm needs to completely cover the Fentanyl patch with a little wiggle room left over on all sides. Also where is the best (cheapest) place to buy these things from? Thanks for any help! :)