The Jetpack is a rare and immensely helpful accessory for traversing the caves. It is most commonly found for sale in a Shop, either as a regular purchase or inside a Mystery Box, and can also appear as a very rare drop from crates, or by breaking the wall behind the Alien Lord in the UFO Crash Site level of the Ice Caves. The jetpack has a base value of $18,000, which then increases by an increment of $2,000 per level, meaning that with a minimum shop value of $20,000 it is the game's most expensive item besides the Ankh.