I still see 4 and 5 up: Act-Age, Vol. 4 (4) https://www.amazon.com/dp/1974715450/ref=cm_sw_r_cp_api_i_fn-xFbKCKNMYD
Act-Age, Vol. 5 (5) https://www.amazon.com/dp/1974715574/ref=cm_sw_r_cp_api_i_zn-xFb2DWFDAE
Try Amazon.