Where can I buy Ichiran Ceramic Ramen Bowls?

I'm planning my second trip to Japan and I want to figure out where to buy one of my wishlist items. I want to buy a ramen bowl from Inchiran.

I don't mean buying an instant bowl / one time use one like the ones sold at Donki and Ichiran, I mean the literal same reusable empty ceramic Ramen Bowl they serve at Ichiran for their ramen. Like so:

https://imgur.com/a/9RecjmA

I'd like to bring back is that bowl as a souvenir, so I can briefly re-live my times at Ichiran with the instant ramen I make at home.

During my first trip, Ichiran didn't seem to have them for sale and I didn't see them at retailers such as at Donki or grocery stores or other retailers. I didn't visit any of the kitchen streets so I don't know if they have them there. Do they?

I posted this same thread on Japantraveltips but didn't get a firm answer. One recommendation was purchasing on Taobao, but they don't ship to North America.

I have discovered the Ichiran Ramen Bowls on eBay but they are severely overpriced. Most of the listings are from Japan and some of the listings have a red box that comes with the Ichiran Bowls. See below for an eBay example:

https://imgur.com/a/M4hT2uH

A suggestion from earlier suggested these might be available from local "Arita Ware" shops in Japan. Again if anyone has any sightings or stores to suggest that have them locally in Tokyo, Osaka or Kyoto, please let me know. Because these red boxes with the bowls must be sold somehow.

I would feel awkward at an Ichiran location if I said, "can I buy the bowl?" but maybe that's the only option.

Do any locals know where you can buy one when I revisit Japan? If anyone knows where they are in Tokyo, Kyoto or Osaka I'd appreciate the recommendation. Please let me know. Thank you.