Agree with John on this. As I write this, price of silver is $20.88 per oz... if you were to buy at $3 over spot (which is about average), that would be almost a 15% fee on the buy side. When you decide to sell, you may receive $3 under spot, again 15%. That means with your $250, you will need the price of silver to rise 30% just to break even. If you don't need the $250 and plan to hold long term, then fine. If $250 is serious money to you and you may need it short-term, silver may not be a great investment for you.
By way of comparison, I can trade 1,000 shares of GE stock for $7.95 a trade in my Fidelity acct. I would not do business with them if they tried to charge me a 15% commission...