These ones might be a little more difficult for you to get since you're in Europe, but often the local coin stores in the US will have them. Sometimes they're out of stock because the coins aren't super expensive, so big-time collectors will buy out all their stock.
Canada also has "junk" silver that's 80%. I'm not sure about the European countries though. @gdwcoins is a great resource and probably has some suggestions on "junk" coins you could get.
These ones might be a little more difficult for you to get since you're in Europe, but often the local coin stores in the US will have them. Sometimes they're out of stock because the coins aren't super expensive, so big-time collectors will buy out all their stock.
Canada also has "junk" silver that's 80%. I'm not sure about the European countries though. @gdwcoins is a great resource and probably has some suggestions on "junk" coins you could get.