Board Thread:General Discussion/@comment-27093599-20181014151815/@comment-36094989-20181014235256

The Model town collection from Marketplace is an extremely rare one. Cufflinks can be obtained from playing Mosaic but most seem to need tools to play serial runs of mosaic. The rest come from rooms that cost me 80-90 energy points (depending on the room ranking) so I usually have to run an SOV to collect those CIs. In short, yes, CIs for flying time are not easy to obtain from playing the game. I do not use flying time much at all for this reason and keep the CIs in reserve for gifting.

Oh, I forgot to mention that Clock Tower has a collection (Academic Treasure) for a tool chest, but it is yet another difficult drop.