Hi,
Found a good resource for all kinds of stuff tractor folks might need. Check out Applied.com. I can get a Qt of Lubriplate Mag-00 Series Low Temperature Grease for about ~$20 or a gallon for ~$60. Applied tech has 400 locations all around the country and you can mail order on the net too.
Been searching for EP-00 or NLGI 00 semi-liquid grease myself and yeah it's a pain. This stuff is made for leaky gear boxes or pumped central lubrication systems for heavy equipment and ones that are gonna leak due to cheap / poor design. I've got an earthquake rear tine tiller that specified "Mystic 00 transmission fluid PN 1690"
Another problem I've encountered is packaging size. I really don't need a 55gl drum of goo costing more than the equipment I'm repairing. I found my fix and offering it up to help you save some time and equipment. This stuff should be great for weepy PTO gear boxes and Applied may be a good source for bearings, bushings, and seals to fix'em too.
Hope this helps