Hi Coquina,
I was reading "Mayo Clinic Guide to a Healthy Pregnancy" and it says this about cribs:
By June 2011, cribs with drop sides will no longer be sold in the United States. The Consumer Product Safely Commission recently voted to implement a new federal crib safety standard that no longer allows the traditional drop-side crib design.
Dozens of infant deaths in the United States over the past decade have resulted from drop-side cribs. The design of these cribs can cause babies to become entrapped and suffocate"
Also, FYI, regarding travel cribs it says "...portable cribs aren't subject to the same federal safety requirements as permanent cribs".
I hope this helps. Good luck with the search!