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Use between for two only. Use among for more than two.
Use for if the actual sum is mentioned, use at if the actual sum isn't given.
If the weight or measure follows the price, use at with the actual sum: That velvet is available at £5 a metre.
When speaking of a period of time in the future, use in, and not after. Here in means after the end of.
Use on with the days of the week or month: on Friday, on March 25, on New Year's Day. Use at with the exact time: at four o'clock, at dawn, at noon, at sunset, at midnight. Use in with a period of time: in April, in winter, in 1945, in the morning. Also at night and by day.