It appears to be out of production according to the henry site I would verify this with henry henryusa.com/contact-henry-repeating/

Hi Wray, the H009 no longer comes without the side gate. I would check on large gun sites like gunbr0ker and Guns International as discontinued and hard to find firearms show up for sale by private individuals and small shops.
Stay safe & have a great day!

Hi Wray and welcome. It is out of production. Unfortunately, when neither Notification nor last listed Price, they don't anticipate getting that firearm back in stock. I would search Gun(6)roker - just replace the (6) with b and Guns International as hard to find firearms are often sold by small shops and private individuals :Another excellent gun site to search is -- gunsinternational.com/ - Cheers and stay safe!