If SJO is like MGA there is an airport run lounge (free for COPA and TACA) 1st class, discounted for some local Visa cardholders, that charges US$35 for a separate security entrance, three drinks and a plate of sandwiches and they do the checkin, boarding passes and luggage.

Apparently you can arrange arrival for the same price, clearing you though immigration and customs and getting your bags. The arrivals at MGA are so fast there is no point using that service but the departure lounge is great.

SJO probably has a variation on that. Check with a local or the airport web site or see if there is a COPA or TACA lounge on their sites, called Sala VIP or similar.

There is also a super VIP arrival facility for diplomats and people like Juanes and Paulina Rubio that is not for payment. I guess it is arranged by promoters etc.