貰｛もら｝える物は貰っておく (idiom?) meaning How should the part be interpreted? What (I) can receive, I ... (?).

To capture the nuance of the original, I would go with something short like:

> "I'll take anything that's free!"

You might think I did not translate expressly the part, but if I did, it would sound pretty wordy.

> "I'll take anything that's free as it might come in handy in the future."