They prefer you to fax one in, but I have seen them out front on rare occassions, or mail one in "way in advance".
You can find the "Fill in the blanks" PDF online permit here
http://www.sgwa.org/Permit_Dayhike.pdf
Instructions are with it.
You can see information about rules on the Permit here
http://www.sgwa.org/permit.htm
You can get information on the San Bernardino's from the San Gorgonio Wilderness Association here
http://www.sgwa.org/index.htm
I've had great luck with filling out permit request on Monday's (even though they are closed on Monday's) and faxing them in to get them back by Wednesday. Remember, Vivian and Momyer are closed until they figure out what they will do with the "Baby Bear" that has been roaming the parking lot, riverbed and picnic area on that side of the mountain, so everyone is using the other trials and there is a "Quota System" in place for the San Gorgonio wilderness so you might not get a permit for the trial you want. Call them the day after you apply and ask what the chances are.
Good Luck.
