hi there!
firstly - IMO dont buy off ebay. Unless it is a reputatable MCN seller store (ie sometime Baby beehinds sell on there).

You bascially get what you pay for - the cheaper they are then nastier and less useful.

Perhaps scout a few of the second hand nappy sites like buy for baby or nappycino or ask if anyone on here is passing anyone to start with?

They definately have saved us money though - now we are parttime - i loathe handing over $$$ for sposies.

As for reactions - you probably find bub is reacting to the chemicals in the sposies.