This will depend on the material you are interested in plating
with. As the price of gold goes up, even plating with gold will
become more and more expensive. Plating with silver will be less
pricey than plating with gold.
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alkaline zinc plating is less expensive to prepare and maintain
, and it do not cause pollution as cyanide zinc plating.
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Gatero's plating offers a nice chrome plating kit for an
affordable price, and you can buy them online at
http://www.gaterosplating.co.uk/Replica-Chrome-Plating-Kit.php.
They also have other plating kits.