You can make a vacuum pump from the pump motor of a discarded refrigerator or dehumidifier. Perfect for the DIYer.
All the reading I've done on aircondition.com tells me that it's worth the effort to mail order Texaco Capella HFC 100 synthetic refrigerant lubricant for your a/c system and nylog for the o-rings. To repeat Greg's link, you can get them at
www.ackits.com