Depends on when you ordered. If you ordered the Basic model during the time period starting in mid-December 2017 they will give you a credit to match the current pricing if you notify them by sending an email directly to support@glowforge.com. (That was the only time that the pre-order price on the Basic model was higher than the current price. They wound up coming down a bit with the final price.)
They announced it in the April status update announcements that were mailed out to everyone who pre-ordered.
Send them an email if you qualify so they can set you up with the credit.