This is really a review more than anything else, but since Tripadvisor apparently doesn't have reviews for rental car locations, I feel like I need to share my story this way.
First off - I know a lot of people yell about travelers not doing their homework when renting in CR. Sometimes that may be true, but most rental car companies also completely fail to adequately disclose what is required by law, what is required by the rental car company, and what is optional, instead they rely on not providing adequate information to then rip you off once you're at the counter. I've rented cars all over the world, and nowhere have I had as much trouble as in CR, despite doing my homework.
We're spending 3 weeks in CR and needed a car for the duration to pick at up the airport - this is obviously expensive, and getting the best deal was really important for us. I spent hours reading horror stories online, avoided 3rd party websites, only used local .cr websites from rental companies to get quotes (which are still horrible at providing the necessary information), and meticulously read the fine print of every quote that seemed like a good deal and that I considered for the final decision.
After all that research I landed on Europcar. Their quoted price was about 25% better than the next closest quote I found. As mentioned, I was meticulous when booking, I had selected the "basic coverage included" option when making the reservation and I had checked the fine print to ensure that all legally required mandatory fees and insurance (liability) were included. Our credit card does cover CDW, even in CR, so I didn't anticipate needed anything else. The quoted rate should be the final price paid.
Alas, when we get to the pickup location, the agent would not rent the car to us at the quoted price. He insisted on adding $700 worth of coverage for a $300 car rental. Despite having documentation from the credit card (our T&C document) that we were covered, despite all the Europcar documents stating very clearly that only liability is absolutely required and included, despite the fact that I was willing to put up with the sky-high hold ($7000) on my credit card, he flat out, and in a very condescending manner, refused to rent the car to us. Every time we countered one of his objections with evidence from the research I had done, he made up some new excuse for why he couldn't rent to us without the $700 coverage, which finally culminated in him asking for us to produce a letter from the credit card company confirming coverage for our specific reservation. I had never had to deal with so much hassle from a rental car location. A this point we walked out.
Luckily, based on my research, I had anticipated such shenanigans, and I had also made a backup reservation at the Sixt. The price for that reservation was $100 more expensive, (which is why it wasn't our first choice) but compared to an extra $700 in extorted coverage it was a steal. We used an Uber to get to Sixt, politely declined their additional coverage based on our credit card protection, accepted the extra $1000 security hold on our card and within 15 minutes we were out the door with our rental car.
TLDR: Even when you do your homework, some rental car companies are better than others, and Europcar at SJO is a huge ripoff. They force you to buy coverage you don't want or need.