I've seen them go for as low as $1500 USD. There's a 1989 on ebay now for $1800 on a buy it now auction. Maybe one of the 7 other Sabre fans will have more accurate info. $1800 is actually high based on the condition. I just found the '79 you're talking about - current bid $1025; day and a half to go; 16 bids already - this is a tough call, but my guess is that it will get up to at least $1800, maybe $2000. I really haven't been monitoring what these sell for because they're not in my budget at this time, but I AM a huge Sabre fan.
cheers, not sure if people like playing them really, saying that i have never played one A little wary of buying without playing and a holiday to the USA is not possible at the mo!!!