If you plan to replace the battery look for a shop that will put in a used 40kWh pack. There are used 62kWh packs also but they are harder to find, more expensive and require some fabrication work to fit since the pack is physically bigger. A 40kWh pack will more or less bolt in but there are some electronic modifications required before it will all work. There are places in Portland, OR that perform this service or you might be able to find something closer to Seattle. At that point, though, it might make sense to just buy a Leaf in the lower 48 and ship it up on the ferry.