Be diligent with used listings.
I bought two bikes used, one last year and one a few weeks ago, and both for excellent prices because the sellers had no clue about the current market and just wanted them gone.
I checked the listings every day, multiple times a day, and when sending a message would always say "I can come right now to get it" and also "I will not haggle on the price", so that it was clear that I was serious and that I would have a chance at being the first person to see it.
Most bikes here, if they're decently priced, will be sold within 1-3 hours of listing. I just listed my 5 year old Rocky Mountain for $200 less than I bought it, and I actually had multiple people offering over my asking price to steal it from the first person who was booked to see it. It was sold within 45 minutes of listing.
I had a ton of messages, but I initially only responded to the first guy who said "that's a great price, I really want this bike, I can come get it right now".