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Personally I would recommend Tarquin's Library as it is fairly easy to complete if you have some minor resources. He doesn't ask for expensive books too often and the most expensive one I've seen yet it from the piracy event and I bought it off of shop search for approximately 250k MP. Ublish' layer is also easy but beware the Antila constellation is expensive 500k on shop search but you can buy it for a little bit less is you buy a dukka coin and then buy it from the pirate ship. Also be warned of the Virgo constellation only sold in the millionaires lodge for 1.1 Million MP.