1) Is anyone else having the same trouble with that site?
They recently changed servers and URL's. When in doubt, login to eServices and select the Communications link in the "Civil Air Patrol Sites" section at the VERY bottom of the page.
2) Any suggestions on a good affordable radio that has more than 12 channels and is P25 compliant?
Here is a direct link to the P25 compliant radios:https://comm.capnhq.gov/comm/equipment/digital_summary.cfm
Whether a given radio is "affordable" is open to interpretation. Some relatively inexpensive radios are expensive to program. I recommend trying to find local CAP members who might be able to help. I started with a Motorola XTS-3000 for $300, but I had access to programming resources.