Hi Linda,
As an Antiques Dealer in the U.K. I can tell you that silver cigarette cases have really taken a dive in price at auction, same with lighters, due to smoking not being P.C. Solid silver cases dating from the 1920's can be bought for as little as £10.00. If you get a good one with a blank cartouche on the front, you can have initials or a message engraved. The shaped silver cigar cases are still making good money, as there are collectors for them, however if you want a cigarette case my advise is to look in your local U.K. auction.
Jacqui.