Some customers just won't be able to afford your payment up front, and without financing, you will never get their sale. So, offer them a few ways to finance the purchase.
Every business has to fork out some form of acquisition cost to get new customers. By offering financing, you'll be able to reduce that acquisition cost significantly, as you're immediately capturing a larger customer base. Other than the standard payment by installations, you can also incentivize your clients to pay promptly by offering certain benefits (such as 5 percent off if the bill is paid by X date.) Be sure to check their business credit, and set a credit limit to protect yourself.