Apple will begin to sell the new MacBook with Retina display beginning this Friday, April 10. The company already confirmed pricing for two configurations, but new details from an online reseller of Apple products suggests that a more expensive option is on the way.

Right now we know about two configurations. One version of the MacBook will ship with 256GB of storage and a 1.1GHz Intel Core M processor for $1,299. A second option will pack a slightly faster 1.2GHz Intel Core M processor and 512GB of storage for $1,599. Now, according to a report from MacRumors that cites data from Expercom, Apple will also sell an upgrade on the entry-level model that boosts its processor to a 1.3GHz Intel Core M chip for an additional $250. That upgrade will also be available for the 1.2GHz model for an additional $150.

In total, there should be four SKUs according to Expercom, including the 1.1GHz model with 256GB of storage for $1,299; an upgraded version of that laptop with a 1.3GHz processor for $1,549; a 1.2GHz model with 512GB of storage for $1,599 and an upgraded version of that model with a 1.3GHz processor for $1,749.