There are commodity ETFs that use future contracts or sometimes just buy physical metals. Some funds buy stocks of commodity producers which are expected to be

There are commodity ETFs that use future contracts or sometimes just buy physical metals. Some funds buy stocks of commodity producers which are expected to be highly correlated with commodity itself. Also in Europe there are Forex brokers that offer contracts (CFDs) on commodities, but there are a lot of scammy firms in this area, and the spreads charged are usually hefty. (according to wikipedia in US CFDs are banned)