i want to start recording but i have a 20 $ cheap ass mic and Audacity.

i got 100$ to spend

what should i get

NOTE: i am a bedroom guitarist with no band, no gigs

The UN-exiled one.
I suggest the EMU 0202 USB over that Lexicon interface. The connection is faster on the EMU and it has better hardware and sound.

You wotn get much for $100...probably an older Toneport and those are not great although they work for ideas and small setups where you dont need good sound.