Inniswood does have plant sales, but you'd have to check the website (there should be a link to the website on Google maps) or call Inniswood (again, phone number should be available on Google maps) to find out when the next sale is.
Google maps should have the companies phone number. Google maps is run mostly by Google admins and local guides like myself. If the phone number isn't yet listed try the parks website! I love gardening indoors and outdoors it's very addictive, I totally feel you. 😁
Thanks! Your answer is awaiting moderation.