Depends on how much they're asking. I haven't bought an Amiga game in years (the last game I bought is prolly Nightlong), but even back then age-old games were going for 'fullprice' prices.
I know, it's illegal/unethical (towards the dealers), but I refuse to pay 25EUR for 8 year old games (then again I don't play em either %).
And yes, I'd still call Lemmings abandonware in that case