USB ethernet adapter?

Hi,

My PCEngines APU died and I need to rebuild my router.

I'm throwing together an old desktop, but ultimately I'd like to use a
Raspberry Pi that I bought to play with.

My network configuration needs 2 wired interfaces. I don't have a switch
that will do vlans, and I don't want to have to configure all of that.

This is only for a 20 Meg (bi directional) connection, so not stressing
things too much.

What would be a good USB to ethernet (RJ45) adapter that is supported by
OpenBSD?

Thanks,
Steve W.