On Amazon, the prices of an electric pepper grinder vary between 17$ to 134$. The most bought one on Amazon is Ozeri Graviti Pro Electric Pepper Grinder, which costs 25$.
Yes, freshly ground pepper does taste fresher. This is because the flavor of the pepper seeds remains locked until the very moment when they are ground up by the electric pepper grinder. If the pepper was not freshly ground and had been previously ground and stored, then it has already lost much of its scent, its aroma, which gives the ground pepper its freshness. Pre ground pepper will still taste hot, but it will most probably not have the flavor or scent of freshly ground pepper from an electric pepper grinder and thus won't appear as fresh.
As far as the salt goes, there's no advantage. The salt is the same whether from a grinder or a shaker. For pepper, however, a grinder has an advantage. Fresh ground pepper is much spicier than pre-ground pepper from a shaker.
$.50 per pepper
an electric guitar can cost from £50 to £2000
it is $5,500 the electric car cost
$2.97
the price of Dr pepper depends on what store you shop at
15 pence
50 cents
29p mate
52 pounds.
way too much