Bass Loop/Line

I'm checking stuff out right now, looking for a funky bassline to loop for this track I'm working on. Still very early stages. What would you charge for something like this? Bass would come in with the drums at around the 15 second mark of the provided mp3. Thank you so much for any info, have a good day!

Additional info:
I don't have a hard deadline for this. I'm interested in working with a very experienced pro. I need parts recorded for one song. I need you to write the part as well. Check out what I attached. I'm an indie artist.