George Pollard
New Zealand
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longagoigo wrote:
You could always use real coins. Just look for a currency with a good exchange rate and good looking coins. I have a sheet of thick vinyl that covers and protects my table, as well as anything I put beneath it.
Even better, you can go for 100% authenticity 
The main page says it's set in about 1000 CE, which Wikipedia tells me is the Nothern Song era. You can get coins from this era for pretty cheap online.
Here is one example: http://chinese-coins.auctivacommerce.com/100-Pieces-Chinese-... (100 coins for 34.95 USD + 12 USD shipping).