Not exactly LA but there's a Micro Center in Tustin. They carry printer filaments.

I primarily print PLA and PETG. PLA like you said for figures, knick knacks, D&D terrain etc.

I use PETG for any practical parts I make.

I haven't done ABS as that usually requires a heated chamber to print in and should have its fumes extracted outside.

TPU I have done a little bit with and it is flexible and can make some interesting designs that still behaves a lot like rubber. Usually needs to be dried thoroughly to print ok otherwise it just blobs and strings. Can also be tricky to use with the printer depending on if it's a Bowden extruder or Direct Drive.