In the USA lately, I've seen G400's in OK to "almost new" listed between $200 and $400 (most were $350-$400 retail when new, before the recent $50 hike; now the new ones run to $450). I'd say most are probably selling around $300-$325.
I'd consider $250 and less a good deal in today's market.
That's significantly more than in the past, but supplies are short right now and demand still high.