Avengers Academy: Black Widow and Hawkeye

Avengers Academy features a PVP team that is easy to acquire and works at lower level brackets.  It'll have a budget, low level focus for the items, and won't use items that are no longer in the rotation at the time of printing.

Grey Suit Black Widow (Tactician):
ISO-8:  Steady
Widowmaker into Flying Kick to remove buffs and put out huge burst damage.  Widow's Bite if you fear lethal retribution from high damage targets.

Heroic Age Hawkeye (Tactician):
ISO-8:  Steady
Heroic Age Hawkeye is the master of multiple focus fire attacks:  Pinpoint Target then follow up with whatever attack is appropriate.  With Trick Arrow for stuns and your primary arrow for a variety of effects you can burn down single targets pretty quickly, particularly when hitting a Widowmaker target.

Scrapper Agent
ISO-8:  Chaotic
Key items:
Sudden Support
High Damage Item (Golden Screaming Eagle)

You want to lead with Sudden Support into a high damage item, to explode the Widowmaker target.  This team, and your agent, really needs to burst down one to two members before the second round is done, or you're probably not going to get there, since both Hawkeye and Black Widow are fairly squishy.

Suggested items:  Bolt Action 4-Bore, and if you are lucky enough to have them, the various damage amplifier items like Arc Reactor Charge are very strong choices.

Summary

Total CP Cost:  72 cp, making this one of the cheapest fully costumed pvp teams you can obtain.

This team wants to focus fire.  Your matches will be fast, furious, and over in a few rounds one way or another.  It's a bit soft to teams with protects since it can be hard to hit the targets you want to hit, but it is a reasonable choice and with a bit of luck with Hawkeye you can have a lot of success, particularly at low levels.