The best free sources you can get candidates are LinkedIn and Facebook. Make use of your network and these social networks' features (for instance: post jobs on your profile and suitable professional groups on Facebook, source candidates with Facebook and LinkedIn search, etc).
Another free or low-cost but very effective channel is employee referral. You can find details at 4 Best Practices to Generate Successful Employee Referrals
Hope it helps!
From Vietnam, Hanoi
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