Just in case people weren't aware of this tool:
poe.ninja
And that's not the only one, there are at least a few others that greatly facilitate buying maps. I didn't really look into them because I used poe.ninja maybe 3 times this league? Just to accelerate finishing my yellows, reds were too expensive so I did those the "hard" way.
What are you people doing to run out of maps? Are you using Zana 1c reroll up to T10? Are you using horizon orbs on reds? Are you scrubbing guardian maps from your atlas? I scrub T15s too, but this was my first league trying that and I'm not really sure it helped much since I never ran my shaped T15.
I ended the league with ~50 each of shaped Moon Temple and Elder UGS. Park an elder blob over UGS, slap 4 (non-shitty)sextants on UGS, chisel/alch/vaal(if shitty quant/pack), run Beyond if the map isn't Vaaled. Congratulations, you will have too many maps now. I put my T6-T13 maps up for sale because of how well the above was sustaining EUGS.
You WILL have to buy sextants and vaals. And likely chisels. The memory modifier for quality currency made them easy to sustain this league. But I only needed to reup on mapping supplies once this league before I hit 37 challenges. The atlas farming strat is almost superfluous unless you're REALLY playing for the long haul.