Howdy Catship, here's how I obtain most of my maps...
Level 1
- Fishing, you can fish up maps directly.
- Fishing nets, I've gathered over 40 level 1 maps in a few hours time just tossing green nets I fished up on my fisher into deep water with my tamer, and you get bonus MIB's on krakens too
Level 2
- Dark Guardians in Doom, hands down. They always have a t-map level 1-3 as loot upon death. I killed about 40 of them in about 15 minutes and ended up with 13 level 3, 3 level 1 and 24 level 2 maps...
Level 3
- Dark Guardians in Doom, see my remark above
Level 4
- I still occassionally do the Hag's quest for virtue gains and t-maps. These mostly end up to be level 4 maps.
* I hardly have to hunt for these anymore though, a few of my guildies are avid Abyss renowned hunters, hunting for the rare artifact drops, and they usually get maps which they drop off into my mailbox, since they know I'm a t-map junkie
Level 5
- Dark Wisps, Ilshenar Wisp dungeon. They die fast and drop paragon boxes which always contains a level 5 map. And I've never personally experienced it, but from what I've heard, if you're fighting a paragon dark wisp, it can drop a paragon box with a lvl 6 map...
Level 6
- Miasma... I've tried paragon hunting, but nothing compares to the Miasma droprate. It might have a 1 in 10 or 1 in 15 droprate, but that's still better than having to fight Ilshenar bloods where first you have to wait for a paragon to spawn, and then have to pray for it to have a paragon chest...
Hope this helps, and happy hunting!