I would only buy used within this time frame.
The only new DACs I have purchased are the Mytek Liberty (so I could see what all the MQA fuss was about) and the DAC in my OPPO HA1, which I have since sold. Both were about $1K. I spent about $500 more for a second hand Auralic Vega and it is in another league. I just bought a MHDT Orchid here that should arrive Friday. I'm looking forward to trying that out. I think there are good deals to be had in the 2nd hand market.
The devil is in the details...which DAC, what price, etc. I bought a Mytek Manhatten I 3 years ago when it was under a year old for 80% of the original price and just sold it for about 55% of what I Paid and really enjoyed it for that time. I consider it a reasonable outcome, but when I tried explaining this to my wife, she was somewhat uncomprehending.
Let’s just say that DACs have gotten really good in the last few years and there is some great gear to be had on the used market