there are plates from 1.25kg to 45kg.Plates above 20kg are
generally harder to find.
Rubber plates will cost more-
1)They are kinder to the ground
2)They dont rust and have better durability
3)Hexagon rubber plates wont roll on the ground and remain at where
you placed it.However, you wont be able to kick the barbell towards
you and have to use strength to pull it instead.