i am interested to find a cheap way to trade silver/usd I know about CME silver big and mini contract but i need some CFD or ETF like product. Looking for bid/ask spread of 1/2 cent like in the silver futures contract and a very low commission like 50 cent / with contract value of USD 10,000

What about the iShares Silver Trust (SLV)?

1/2 cent spread and 50c commissions on trade value of 10k rules out ETFs.

You're probably looking for something that dosn't exist, futures is the most effective way there is, you won't find those spreads and commissions in any CFDs or ETFs. SLV ETF is the most popular but spread is minimum 1c or 2c and commissions will be at least $2+.

thanks everybody for your suggestions. I appreciate your suggestions, but SLV would only be possible if i can get 100% guarantuee that fill will be in de middle. example 17.89 bid 17.90 ask. I know that through Arcaca or Bats or some other ecn's i have a possibility to have execution in 1/2 cent. (at 17.9850) For example through Interactivebrokers smart order routing or some other software which arranges fills at 1/2 cent. But i only have a chance to be filled in the middle. Besides of that even a 1/2 cent spread is not always interesting for me. Anyway Thanks!