Many dealers stock their guitar lines by using a financing program (called floor planning) whereby they make partial payments to the lender, with the full amount for each guitar to be paid within one year from delivery to the store. If the guitar gets sold - the dealer pays off that guitar. So the longer the dealers have the guitar, the more likely they are to push them to customers even with deep discounts. Many dealerships sell their stock to other stores as the end of that year approaches. The second store can then finance that purchase with their lender, starting the process all over again.
It is possible to buy NOS guitars at stores that can't sell them. I once bought a Dean E'Lite (now called Cadillac) that hung in the store for 8 years. For years, I kept telling the salesguy "Hey, when the owner is ready to sell it - I'll pop for $100". He'd laugh and say "okay". One day the owner walked through and asked, "How long have we had that damn guitar? Get rid of it!". The salesguy immediately called me, telling me it was now or never. I drove over right then and handed over $100. The store owner was glad it was sold within the hour. I got a spanking new Dean (with a bit of shop wear) with case and case candy. Dean flipped when I sent the warranty card to them. They called the dealer - "Was this guitar stolen?". "No, we finally sold it for $100". Obviously, the store made only one order from Dean.