Transmitting a 3G-SDI signal at a range of 300m

Hi

I will need to run 6 3G-SDI cables from two Marshall CV506s and lower quality 4 ABUS cameras into a ABUS recorder unit.

From what I have seen the available fiber optic options are extremely expensive.

What would be your recommendation regarding this problem?

Thank you!

Edit: Thank you for being an amazing community I appreciate your responses