That's about what I saw as well for GS500. I've a few EX500 around $3k however.
As for the best time to shop, I've heard different takes on this. Some say it's best to shop in the spring as people see the new bikes and want to sell their older bikes. Some in the fall as as people don't then have to worry about storing their bikes before winter when they want to sell anyway.
I say there no real "best" time. It's kinda be at the right place at the right time.
As for me, well I still don't know if I'll be able to afford one tis year. Just changed car because the lease was up and I'm waiting for the damage from the taxes.