Before you ask, no, these are not CD quality files. However, their sizes are small (all under 2MB).
I don't know where you can get more. Sorry.

Well, I tried to upload the songs but FortuneCity refused to receive them and told me that the largest file I can send via FTP can be 1MB.
So, go to Serpent's Bubblegum Crisis Page to get the Bubblegum Crash! songs. No BGC songs there. I apologize.
All the links listed below are dead.

Bubblegum Crisis MP3s

Konya Wa Hurricane
Mad Machine
Angels Dancing in the Thrill
Victory

Bubblegum Crash! MP3s

MegaTokyo 2034
Kiss Me, Boy
THIS NIGHT
Somebody

MIDI Files

Mad Machine
Mysterious Night

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