Most will leave from T.I. Maybe 8 mile to Kinni ..
Other options are St.Croix bluff park, if you have a MN. park sticker it's free, or get a day pass. Limited parking for about 60 trailers, so if full you have to wait till some one leaves. Fisherman come early and leave early afternoon. Timing is everything.
Hubs is in Hastings. Not sure of rates. Shouldn't be a problem there with waiting to launch. Maybe 4 miles from Kinni.
Windmill in Afton, must be about $30 to launch now. Plenty of dock workers to help launch and load, golf carts to take you to and from your truck. Maybe 4 miles from Kinni.
Beanies across from Hudson, not sure of rates, maybe 6 miles from Kinni.
Might be others ...