I think you can ship them to Self Edge and it'll cost $15-25 for a chainstitch? I forget.
I couldn't wait that long, so I just went with a normal single lockstitch. The lockstitch has held up well and is stronger than the chainstitch.
My jeans are kept cuffed besides for certain pairs of shoes, no one is going to notice. I'm sure even if a SFer walked back, he would not care if your jeans are chainstitched or not.