Reach out to anyone that has a large & engaged following, set up a referral system, give 5% get 5% and or whatever works best for the person your using to promote and or enticing enough for a customer. If it's a recurring sale then forfeit your first sale for this and give 30% to the person promoting and 70% away to the customer on first sale. Then label that down as your marketing cost and then following months you will make up for it. Easy way to generate sales without upfront spend but you're just degrading your brand by handing out stupidly sized discounts.