Unfortunately J70 sailboats are in very high demand in the Seattle area. And probably for the next 5 years. You’ll most likely find available J70 boats outside of the Seattle area.
Currently there are at least 4 sailors based in Seattle with cash-in-hand looking to purchase a J70 right now.
A J70 ready to race with good running and standing rigging, a Vakaros Atlas 2, sails less than 3 years old, electric outboard and a trailer can easily go for over $40k. There are bargains available but buyer beware as refurbishment up to "race-ready" can be costly.
Transportation costs can significantly add to the purchase price. A recent J70 purchase in January of 2025 required transportation from St Petersburg, FL to Seattle and cost $4,200. A 2023 quote from Key Yachting to package and transport via seagoing containership was approximately $7,300 to ship a J70 from Southampton, UK to Seattle.
A few suggested links for J70 sailboats:
https://jboats.ipbhost.com/forum/17-j70-boats-for-sale-or-charter/
https://www.yachtworld.com/boats-for-sale/make-j-boats/model-j-70/
https://www.boats.com/boats-for-sale/?make=j-boats&model=j%2F70
https://www.keyyachting.com/used-boats/
Another option is to reach out to the J70 class regional fleet contacts in your area. https://j70class.com/class-office/fleet-contacts/ These fleet captains are well aware of their various fleets and may have insight into boats that are for sale but not publicly listed at a broker.