I notice you're from the States
In Australia, most coin/PM dealers have a buy - sell spread, as one of the other posters mentioned, their buy back will usually always be under the current spot price
This is fine if silver spot went up dramatically and you bought low when you went to sell to them, they pay cash/direct deposit the bonus is they are recognizable established businesses, not someone you have never met, meet up somewhere and do a cash transaction with them knowing you have bullion on you
Sites like SS would be the best bet to offload
Cheers
Alfie