I've seen pics of the Brush Egg. My thinking was it wasn't all that different from the silicone pore cleansing pads, like the one Sephora sells. I think one came with some cleansers, too. If you already have one of those, it might be worth trying that first before buying something else. I will try it with my silicone pore cleansing pad if I have a stubborn brush, although that rarely happens.
The face silicone cleansing pads are about a dollar on eBay, they also have the Brush Egg, or a knock off, for $2.00 or less with free shipping for either item. The downside on eBay is these items are usually from China and I know some don't buy from there (China or eBay) and you would have to wait a bit longer for shipping.
CeeCee