Most firearms were muskets, and cost 1 Pound Sterling. There were a few rifles, such as the Ferguson, but they were very pricey- about 4 Pounds. But to keep this in perspective- a Pound ($5 Continential Dollars) was a good part of a year's wages for many people at that time.
dolla dolla
two dollars
Depended on the rifle. $5-$500
blue
No such weapon.
$10
in general 180 $ is the minimum for a reliable rifle.
$ 9000
$2300+
30$
$200-1000 USD in 2012
$1,032 per rifle according to the DoD