Taz Unless the prices are posted such as in a store, you are probably paying a Gringo tax in everything you purchase or in everything do. Even if the prices are posted, such as in a hardware store, you can get a discount if you are a Tico and you ask, almost demand it.
One of the guys on another thread wants to go on the Tico Train from San Jose to Caldera; there are two significantly different prices -- Tico and tourist. All of the National Parks, most of the hotel rooms in tourist areas, and most restaurants in tourist areas have two sets of prices. In restaurants they often keep two sets of menus - Gringo and Tico. And it isn't just the language that is different.
There are Gringo taxes nearly everywhere. Even if you are a citizen but look really Gringo, and especially if you have an American accent, they will try to "tax" you.
One of my son's is Tico-Gringo and looks more Tico than Gringo. He speaks Spanish but because he has spent nearly all of his life in the US so he speaks with a noticable American accent. They try to up charge him. He usually doesn't argue too much. Very American.
On the other hand, one of my nephews is puro Tico but is Gringo looking -- red hair and freckles. He speaks Spanish as his native language. He studied in an English school here in CR and then lived with us in the US for a couple of years. So based on looks and the fact that when we are out and about he speaks English to me, the locals try to put the Gringo tax on him. He is very forceful in making sure that he is not "taxed."