You can eliminate the hiring cost if you are willing to put in some time and effort yourself. Seeking referrals from peers, family and friends or your employees can help avoid hiring cost for new employees. However, it is a good practice to give a referral incentive if you ask your employees to refer candidates.
Building a strong brand helps as interested candidates will visit your website to apply for available jobs. Have a career section on your website. Update open jobs in the career section. Post on all your social media profiles to spread the word.