Actually Recommended Gundam Base Limited Kit #2: Eco-Pla (Old HGUC Kit)
When it comes to products sold at Gundam Base, of course, there are Gundam Base limited kits, event limited items, other related products, and sometimes surprise re-releases—Gunpla that are generally sold but rarely re-released, or re-releases of originally planned general releases.
Surprise re-releases and general release re-releases are updated in real time online, and the stock of limited items can be checked on the website.
However, there are some limited items that are like an off-menu item, with their stock not listed on the website.
That's Eco-Pla.

A secret menu item at the Gundam Base | サイハーン・イツダヨ's Gunpla works