My guess would be they won't be that great...one possibility if you sew or know someone who does, could be to buy some bamboo material and make boosters for the cheap nappies? It might work, I use bamboo or hemp boosters with some of my cotton nappies.

Another cost effective option is to buy a one size nappy like Baby BeeHinds fitteds, or BumGenius Pockets. Yes, it's a larger up front cost, but most places you can get them from offer lay-by, and being one size, they are usable for bub at any stage. In fact, our Baby BeeHinds Bamboos which we bought for #1 are in great condition on our #2!

All the best, cloth can be a pricey outlay, but it still is super cheap compared to disposables.