Most of the hookers in bars can be found in the Blue Marlin (inside Hotel Del Rey), which is 24 hours and between 7pm-2am to the Bar Key Largo next door.
The key largo doesn't usually get ramped up until 10pm when the live music starts. Some times if you wait until 1am to pick out a chica you can get a better price because often girls go home empty handed at closing time. Also, most bargirls ask for $100 but its negoitable.
There are plenty of daytime massage places, and the cost there is usually $20 to $50 for a thirty minute or one hour session (sex included no tip required). Right now the hot stops for cheap sex are Las Margaritas (night), New Fantasy (day) and La Mansion (day). Veronicas and Oasis are also pretty sweet but is a $2 cab ride.
The dongordo map is older than dirt, and out of date. CRT wants you to pay $$$ before you can see their map.
http://www.sextourcostarica.com/san-jose-sex-guide/
The San Jose sex guide is free and breaks the city into 6 seperate areas with lonely planet type google maps that shows every whore house, pickup bar, and massage parlor in town.
The Del Rey would seem like a good place to stay, but they charge $10 for each girl you take to the room.
http://www.costaricasmtravel.com/cat...a-rica-hotels/
That page is a wrap up of every hotel in town that allows you to bring "dates" back to the room.
have fun.