Re: Silver 30mm rings
presuming that base is the 'Redfield' style, i.e. features turn-in front and rear is held via opposing windage screws, then you can use Millett rings. 30mm medium in their nickel finish are #SR00905, and high version is #SR00906. Either has a dealer cost of $23.05.
These are made to fit the Redfield style bases (as sold by lots of companies, including Leupold of course). Not to be confused with their 'Angle-Loc' rings, which are designed to fit Weaver style bases.
it's not about need in the USA -- it's about WANT