Most online magic shops sell half dollars and there's always loads on ebay. Average price is about £1.50 approx, but by the time you've added postage it can be another quid on top. Combining postage with other magic purchases is the best way to keep the price down I guess. Half crowns are much cheaper but slightly bigger, thicker and heavier. Old english pennies are practically the same size as half dollars and are thankfully dirt cheap on ebay (I got a dozen for under £2 the other week). Exactly the same size as penny's but more exotic are British West African penny's - these also have a nice hole in the centre, very handy for The Charming Chinese Challenge and so on. However, they are getting quite pricey at the minute at about £5 a go!! Much better value is the British East African 10 cents coin - identical in size to its western cousin and has an equally charming design on the face - they are also far, far cheaper on ebay(a bag of assorted BEA coins goes for about £6 and includes about eight 10 cent coins, five 5 cents and a few one cents). Going up in size, I bought some excellent (and cheap) replica morgan dollars for very little cash (will try and find the site if anyone interested), and some good luck chinese coins of dollar size (again, loads on ebay - mine were 2 for a fiver). If the image uploads ok then the ones in the photo are as follows, clockwise from top left:
British West African Penny(front), Morgan Dollar, Chinese Dragon Coin, 3 British East African 10 Cents(front), British East African 10 Cents(back) English Penny, Half Dollar, British West African Penny(back). Hope this gives you an idea of what's out there.
