um...
Caviar is not that uncommon...
in fact... the International supermarket I work in... sells Caviar... and it's pretty cheap too... 10 USD for around a shot-glass sized Caviar. (abit it's Russian brand Caviar, lol)
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Also... yea... the Slime have literally zero clues on how the world works, so he should really be kept as a Pet only...
You should not let it loose, else it will pretty much die in under a minute... (just like Slimes in games, dumb slimes)
Think of this, the Slime goes into the restaurant by itself an ordered bunch of things, but have no money to pay for it. What would happen? DEATH.