Is there a budget version of Collected Company for this Modern elf deck?
No, there isn't.

Collected Company is one hell of a card. It's 1) instant speed, 2) card advantage, 3) usually mana advantage and 4) half a tutor. CoCo (as it's often called) is the best card in the deck, and there's nothing that can compare. 

You could potentially run Chord of Calling, but it's significantly worse because convoke works really badly with mana creatures which you have a lot of, and besides Chord of Calling is also an expensive card. Otherwise there is Lead the Stampede which will draw you cards, but does not put them into play; and Eldritch Evolution which will tutor a relevant card, but is not nearly as efficient (and isn't cheap either).

If you don't have 4 copies of Collected Company, you should still run as many copies as you can.