Unexpected prices

Last week I posted up some Garmin GPS units to eBay.The thing is that I am expecting the 390LM to go for a higher price than the 550. Even though the number "390" is lower, it's a far newer and better GPS than the 550. The 550 was Garmin's first entry into the motorcycle market. While this is a good GPS unit, there are better ones.Even more oddly, it's now hovering above my buy-it-now price I had originally set.Not that I'm complaining about that one!But the 390 is still sitting at the opening price with just less than a day to go.Go figure, I suppose.