Silver Over Spot

An old rule of thumb I used to expect to pay was about 10% either way. For example if silver spot was $10.00 to make this easy, I could expect to pay about $11.00 to buy that .999 oz and if I were to sell it to a dealer, I might only get $9.00. When buying in bulk say 20 ounces, of course your dealer would probably give you a better deal.
Coin bullion value would be different and they generally charge a 15% refining fee whether the coin is ever melted or not when you sell it to them and the coin is not 100% silver like the bars you are inquiring about.
I don't know what spot is today but tomorrow it can be different.
We can't expect them poor dealers to lug around all that heavy gold and silver for nothing, they have to make a profit on the stuff. Sometimes they buy high and sell for less than they paid too, but being constantly in the business, they generally make a good average 15% percentage on it coming and going. It all comes out fine in the wash.

With silver spot back under $11, $13.50 is a little high for generic bars/rounds. The problem is so many people are paying $14 for generic 1 ouncers it's hard to get them for much less than that.

APEX.com is offering new 10 oz bars for $128.90.
http://www.apmex.com/Product/43308/...___Live.aspx

If I were buying generic right now, I'd look for $13 as a good price.

Engelhard is a reputable longtime company. Many of their bars are with serial numbers, some of the bars are even worth a premium as collectible. Never made any difference to me. The dealers never gave me extra selling them back but you can get some generic rounds a little cheaper. I never had a problem selling the ones with Happy Birthday or a crude Buffalo nickel copy on them.