There's a metal scene in Costa Rica but struggles a lot and seldom keeps together (bands I mean) for long period of time. Also there's a tendency to copy mainstream sub-genres (black, power, goth) and many try to sing in English which actually diminish the originality IMO.
From the bands I can testify they're good (to my taste) are Slavon, Mandragora and Trauma. Don't know they're actual status tho'. You can check maybe at M-A for more info.
As UM mentioned most metal on the stores is mainstream extreme stuff, not much interesting to buy locally (for me), so I get stuff online from US.
Many bands have toured through our borders: Rata Blanca, Helloween, Dark Tranquility, Hammerfall, Avalanch, Masterplan, Marduk, Gamma Ray, Sepultura, Misfits
NP: Sabaton - 'Panzer Battalion'