On the G10 front, I found this, which appears to be the cheapest G10 for a Bambulab printer out there:
https://www.amazon.com/gp/product/B0CPDY2PYH/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1
I presume it would need some kind of adhesive to hold it down to a Bambulab spring steel build plate. Is there a high temperature VHB tape or something similar that would be well suited to that?