Yes, there are a some Aikido Sensei here that are practicing. I can tell you about our Dojo in San Jose downtown.
Please try:
http://www.atemiryu-cr.com (Costa Rica)
http://www.atemiryu.com (our parent dojo (english))
I appologize since the page is only in spanish , but I am working on the english version-
Our Dojo currently has Aikido, jiujutsu, kenjutsu, taekwondo, karate, kun-fu, taichi, chikun and other.
Aikido is practiced on Tuesdays, Wednesdays, thursdays and saturdays. Each class is between 1.5 to 2 hrs, 8 pm on weekdays and 3 pm weekend.
Please feel free to contact me directly to my email (webmaster) or our Shihan at the mail address at our website.
Hope this helps. And we will be looking forward to practice with you.