Does anyone know what the market is like in cigarette cards at the moment? I have six complete sets of Park Drive cards from the 1930s, all in excellent condition. I've found some prices on the net, but they all seem to be from two-, three- or four-year-old catalogues. Ebay is not, I think, a reliable indicator, as sets priced at £20 in said catalogues are up to just a couple of pounds on ebay.
A specialist auctioneer will give you a current value. Try T Vennett-Smith in Nottingham. They sell thousands of cards a year at auction. What these fetch depends very much on the subject matter, the condition, and, of course, any rarity value: