okay forget polycarbonate.
2 reasons.
1) It needs high nozzle and bed temps that most <$500 printers won't do.
2) it needs a heated print volume and is a real pita to get it to stick to anything useful. A
And once you do get it to stick - getting it off can be virtually impossible.
Polymaker give you a sheet of of buildtak with the pc spool. It did stick, but destroyed the sheet in the attempt to remove the print

the qidi replicator pro clone is probably tour best bet: https://www.amazon.com/TECHNOLOGY-3D...s%2C260&sr=8-4

But that's nearly $700
There is a reason you don't often see dual extruder printers under $500.
there's this: https://www.amazon.com/GIANTARM-GEEE...gateway&sr=8-4
Basically and ender 3 style with extra extruder. The design throw up so many issues. The central support print bed with no side rails i3 design, is something I would personally avoid.

People do get good prints from them. judging by all the issues we see round here - probably not that many :-)

This is a much better looking machine: https://www.amazon.com/FLSUN-Printer...ateway&sr=8-16

That's probably as good as it's going to get.

Mind you then there's this: https://www.amazon.com/Geeetech-Rost...ateway&sr=8-41
three-in-one delta.
Rather you than me - just trying to work out the slicing could give you migraines :-)
For the money, the flsun looks like a decent buy.