Here is the direct link for caculating the melt value of silver US coins:
http://www.coinflation.com/coins/silver_coin_calculator.htmlWhat you get in the roll would be pot luck.....poor quaility to good quality.
In the US it is not uncommon to encounter sellers like nonope who over time has built of rolls of silver coins since silver coiins do still circulate in the US (each year less and less circulate as more get pulled from circulation). The US mint last made 90% silver dimes and quarters in 1964. So if you were to buy a roll from nohope, then I don't think the roll would be full of poor quaility coins but at the same time, it would be common date Washington quaters.
Prices for rolls would go up if you ask for certain dates, mintmarks, and condition. Which I have done with sellers when completing my silver Roosevelt dime collection.
www.numismedia.com/fmv/fmv.shtml is a useful site to give you an idea of what particular US coin might be worth in various grades.
Now the fun part about buying silver in EU countries.
1) VAT is charged when buying silver coins from dealers (Maple Leafs, Britannias, American Eagles, etc).
2) Customs duty (and in the UK a handling fee) can be encountered when bringing coins in from outside of the EU. Some sellers will not put gift on the customs. In the UK this needs to be paid before the item can be delivered to you.
I have been had this happen once and it made the silver bullion coin rather expensive.....of course a mistake was made by UK customs who read the declared value as being in pounds not US dollars. So I got a refund of the customs duty but not the fee they charged to handle the item.
What sort of silver coins were you thing of, so more advice can be offered?
Ken