I found a small craft paint shaker on eBay that looks interesting. Its small and pretty simple. Price is not outrageous either, but it is limited to one small bottle at a time. Just search eBay with the title below. Robart 411 Paint / Polish Shaker with AC Power Supply for 1/4 oz to 1 oz Bottles Ooops... never mind. I just saw other thread in this forum talking about it already!