I know I found a thread like this somewhere, but I can't seem to find it anymore. Someone help me out?

Well, there is the units section.

Just enter the power or TA you are looking for, then click on the 'points' column to sort.

I don't understand.

Do you want to know the cheapest figures with the powers and team abilities, or do you want to know what are the cheapest powers and team abilities?

No, sorry, I didn't explain it very well. There was a list of all the powers and all the TAs, and the cheapest character who had each of them, either as an opening click or midway through the dial. It was really neat, and I can't remember where it went.

NV is exactly right. Check the "Units" section at the top of the page, select the power (or TA), then sort by point cost. It's a very user-friendly system they've made there.
As a note, most of the "cheapest powers/TAs" were in the first 2-3 sets released. I still have a number of Hypertime figs because of the cheapest Bat Ally (Robin), cheapest PD (R Police), plus IC for the cheapest Stealth with OW (R Black Panther), etc, etc, etc.

Search results for each team ability, sorted by point cost from lowest to highest:

DC
Batman Ally
Batman Enemy
Calculator
Crime Syndicate
Green Lantern
Hypertime
Injustice League
Justice League
Justice Society
Kingdom Come
Legion of Super Heroes
Mystics
Outsiders
Police
Quintessence
Suicide Squad
Superman Ally
Superman Enemy
Teen Titans

Marvel
Avengers
Defenders
Fantastic Four
Hydra
Masters of Evil
Minions of Doom
Morlocks
Power Cosmic
S.H.I.E.L.D.
Serpent Society
Sinister Syndicate
Skrulls
Spider-Man
The Brotherhood
Ultimate X-Men
Ultimates
X-Men

Indy
2000 A.D.
Arachnos
B.P.R.D.
Crossgen
Crusade
Danger Girl
Freedom Phalanx
Guardians of the Globe
Kabuki
Top Cow

All Companies
No Affiliation

I bet you're looking for this one:

http://www.hcrealms.com/forum/showthread.php?t=194650

by dernjg

It was pointed out to me by anonym0use.