Yes unfortunately RootMedic and PFertz are no longer in business due to personal reasons. If you have not already done some research then do it to figure out what fert process you will like to try. One that works for many people and be changed is PPS-Pro.
Nilocg can set you up with the dry ingredients for a very good price. Just follow instructions (there are several good calculators on this site for precise measurements) and dose.