Well, ALL cents (in fact, all coins!) are minted, so that isn't a distinguishing characteristic. Wheat-back cents were issued from 1909 to 1958 at all three mints, so you've asked a very broad question. The value of an individual coin depends primarily on its date, condition, and mint mark; there are also varieties within some date/mint-mark combinations that also affect values. Without more specifics it's not possible to give an exact answer, but you can look at a web site such as http://www.pcgs.com/prices/frame.chtml?type=date&filename=lincoln_cent for a list of values.
Values depend on date, mintmark, and condition. Post new question.
"Wheat" cents were minted from 1909 to 1958. A 1998 cent is a Lincoln Memorial cent and is only slightly less common than beach pebbles so it's only worth one cent.
No 1908 Indian cent is worth that much. The highest value currently listed for that date is for a cent in MS-68 condition and minted in San Francisco; as of 12/2008 it's about $5700.
Of course, all US (federal) bills and coins are legal tender, a 1793 chain cent is still legal tender as is a cent minted in 2013. Since 1992 bills/coins haven't been changed significantly enough to warrant collector value (or bullion value) beyond face value so they are still in widespread circulation.
50 cent
Face value only. Billions were minted.
The coin is Zinc coated steel not silver, no US one cent coins have been made of silver. Average value is 5 cents.
It's a wheatback-search images using that term
Looks like today's cent except for the back. Search wheatback pennies for more.
1 cent. Billions were minted so they're hardly scarce.
No such thing. Wheatback pennies started in 1909, also known as Lincoln pennies.
1989 is common -- they minted over a billion of them -- it has no added value
50 Cents
One cent.
The last US large cents were minted in 1857.
Unless there is something special about it, its value is one cent.
Such a coin does not exist. There were no Australian 1967 50 cent coins minted.