Retired Military here.
I would think that you should have your preps in order first,because you have to eat and survive when or if you believe that S could HTF.
ultimately you have to make that decision to sell or not! I would not sell myself if I were to have precious metals I would be holding. The world markets and politics are doing strange things theses days and it is extremely unpredictable, meaning it might get tougher to buy PM's later
If I was in your shoes I would try to budget and cut down in other areas to make myself come up with the extra Presidential Flash cards. Do up a list and find out where you are lacking ....Ammo , Guns, Food, survival gear and such, then set priorities. you can't do it over night, sometimes it takes baby steps