My order when im looking:
1. spam my alliance chat
2. Lady M
3. West Brit
4. Luna
The last two of course probably vary by shard as to where people seem to sell/bank in masses. If you approach those areas with 2-3 ppl in a circle group already, you are really likely to get additional weavers (they seem to not like to be the 2nd or 3rd, but when you offer up a lvl 4, 5 or 6 focus they tend to flock).