Hi guys, where can I find material I need for 3D printing, generally?

What exactly do you encompass into "everything?" Like filament and accessories? Are you including tools into "everything?"

I know octave.com has filament and some accessories and tools.
Qu-bd.com has got a lot of good stuff like parts and accessories.
Mcmaster.com is where I get a lot of hardware and tool stuff that I can't find locally.

I don't know of any site that really offers everything you would want or need, hopefully someone else will chime in on a really good site they know of.

Edit* There may be some other sites based outside of the U.S. but I don't really check those out as I don't like having to order thing from overseas.

And all kinds of filament and sands, things like that...

but thank u, ur information is really helpful

If by sands, you mean powder, there aren't any powder-based printers currently that are cheap enough for a hobbiest to afford.  Filament has to be mail ordered, there aren't really enough printers out there for stores to stock filament locally.