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L293 is a very standard motor drive chip, you should be able to get it from RS, Farnell, or Digikey. Tricky Dicky etc will only have the DIP package, whereas you want the SMD. But as everyone says, if you can do it yourself all well and good, but paying someone to fix it may well not be worth it. Hopefully you can find a hobbyist locally who can do surface mount.
Cheers,
Jason.
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