Valuable coins can be found in a large variety of places. This is particularly true of rare coins, which are often bought and sold by individual owners. Rare coins are traded in such diverse places as antique stores and online auctions. If you are searching for rare coins, it is essential that you do your research and know the value of different coins, because they are often not accompanied by identifying certificates.
Bullion and proof coins on the other hand, are relatively easy to purchase. They are available both in physical and online stores.
The Scoinshop, for example, is the retail branch of the South Africa Gold Coin Exchange (SAGCE) and offers a variety of bullion, proof and rare coins.