Kreativ Sounds has released LOOPS TB-303 Bass Line, a collection of 52 loops featuring the sounds of the Roland TB-303 synth. Each loop is a signature sound on its own, you'll not find multiple processed variations of the same loops. All are original (created and recorded by Kreativ Sounds) and all are royalty free.
LOOPS TB-303 Bass Line features 52 TB-303 acid and bassline loops; 44KHz/24bit; REX, ACIDized WAV and Apple AIFF.
KS LOOPS TB-303 Bass Line is "pay-what-you-wish" (donationware).