Offer financing/installment plans
If you sell something a little on the expensive side, you might consider financing that purchase. You can do this via in-house credit or an outside vendor, such as Paypal. If doing Paypal, you can create a button for website payments that you can set the dollar amount monthly and the term length of financing.
This is a great way to get customers who you might not otherwise get if asking for all the funds up front.