I just got the cheapest one I could find. Kind of like this:
You cut the middle out of the shelves to make room for filament. Mine can fit two rolls stacked on top of each other. It works great and you don’t have to worry about melting rolls in the oven by accident.
There are some reasonably priced ones online if this is the kind you're looking for. I got one at Walmart for $40 and it exceeded expectations. Here's an option: vvv https://www.amazon.com/dp/B00VHLXAQC/ref=cm_sw_r_apan_glt_i_K2T7K51RJHEVGYJJ2CCS
I'm still waiting for these to be delivered so I can't really vouch for whether or not they are any good yet.
Spiralizer/Mandolin The combo tool ended up being cheaper than just getting the type of spiralizer I want, but I think I may need to get an adjustable mandolin sometime in the future.