There are many, many chain motels all along the I 95 exits. I cannot name a specific one, but stop at a rest area or Welcome Center and pick up one of those coupon books (roomsaver is the name of one). They have bargain coupons, little maps and all the exits marked and you can probably get a really good deal. These are Walk-In prices, but usually you can get a room, without dificulty unless it's a Saturday night. Their prices range from about $30 up. Remember, if you're just staying overnight, you just need a place to sleep. Probably a pool, fitness room, etc. are unimportant, and therefore, not worth paying for.
Have fun!!!