Maybe others wonder if the limit of gold in the game should be a hard limit for how much gold is available in the land. In most cases, you won't run out of gold unless playing with a lot of players, BUT...
Here are some links, though most coins are LARGE! Haven't found any of a more appropriate size, so if you do, share the link with us. And be careful; some vendors may be charging a bit much in S&H, so check it before doing the final purchase step.
http://www.amazon.com/Plastic-Gold-Coins-100-count/dp/B000R4OBE0
http://www.amazon.com/Century-Novelty-Plastic-Gold-Coin/dp/B001OXGF0G/ref=pd_sbs_t_2
http://www.amazon.com/SmallToys-144-Ancient-Pirate-Coins/dp/B0019IF4VC/ref=pd_sbs_t_5
http://www.amazon.com/Windy-City-Novelties-ANCIENT-COINS/dp/B001ANT3YA/ref=pd_sbs_t_8
http://www.amazon.com/Gold-Coin-Value-Pack-400ct/dp/B001Q5RP4C/ref=pd_sbs_t_9
http://www.amazon.com/Lot-100-Metal-Pirate-Coins/dp/B001BKVRP0/ref=pd_sbs_t_11
OOOOO! Gemstones too! Wonder what they'd be worth in the Talisman land!
http://www.amazon.com/SmallToys-12-Gem-Stones/dp/B0019I8OE6/ref=pd_sbs_t_4
http://www.amazon.com/Faceted-Gemstones-Lb-200-Bag/dp/B000GPNM40/ref=pd_sbs_t_17