A great way to attract new customers or get your existing customers to buy more is to offer them a taste of the value you have to offer. Give people a free demo, free trial, seminar, or other offer where they get to see your products or services in action.
If you want to offer something limited, choose a select group of your most engaged buyers since these are the ones most likely to purchase.
Establish a repertoire of these techniques and you can employ them whenever you need a quick burst of cash. If you understand the times in the sales cycle when your sales lag, you can prepare well ahead of time to mitigate the costs.