Yeah, no one really messes with airbags in the aftermarket. Used parts dealers don't like to mess with them much either. Dealer, a U-Pull-It, Pick-A-Part, Pull-A-Part type junkyard; or a repair are probably your only options.
Since you have it off now, you can take the harness to a shop and see if you can get it repaired. Automotive shops are your best bet, but electronics or appliance repair shops might also be willing to do it. For a proper repair it will need to be soldered and heatshrinked. Make sure that's what they will do. Butt connectors and wire crimps are unacceptable for airbag wiring repairs.