If you're anything like me, then you tend to re-use things, most times until they pretty much disintegrate from usage.
I'm also a crafter, and I make glycerin and gelatin products as well, so I'm always on the lookout for bottles, bottles that won't cost me a fortune (I like to pay about $1 per bottle; I found a great deal on bottles at my local dollar store, Mighty Dollar, and cleaned them out. Sadly, they've never re-stocked.).
And so I came upon the idea, after much consideration, of going back to the Mighty Dollar, or even Wal-Mart (because their brand costs right around 88 cents), buy new bottles of hand soap, dump the soap into the big refill bottle in my cabinet, and use *those* bottles for my soap and lotion products.
The down side to this is, the Wal-Mart bottles come with some pretty labels that leave a hideously sticky residue on them.