This Krystal charm is one of several that feature different Star Fox characters by Saraba Tikyuuyo. It's fairly rare to see a physical item like this for Krystal, even an unofficial fanmade one. Unfortunately, according to the charm item listing, the charm is sold out. Fortunately, the item is listed as an "on-demand" product. In theory, more of these could be made. The charm costs 800 yen, or just over $7.
As for other items, there's this Krystal and Fox card holder by Kabe Tea Shop.
Thanks to Smokey for the heads up.