Metaverse Supermarket

This challenge hasn't been passed by anyone yet!!!

We are all living in the Inflation Metaverse, a digital world dominated by the INFLA token. Stability has become a scarce resource and even going to the store is a painful experience: we need to rely on oracles that sign off-chain data that lasts a couple of blocks because updating prices on-chain would be complete madness.
You are out of INFLAs and you are starving, can you defeat the system?

Source: ChallengeMetaverseSupermarket.sol

Challenge author: adriro