Thanks for all the interest. I know I'm going to need more, and I hope to know within a couple of days how quickly I can get them. For such a simple thing there's still a lot of moving part, but I'm trying to get everything tied down as quickly as I can. I suspect the first 100 are sold ( I still need to do the spreadsheet, weekend activities are conspiring against me (thanks Ikea!) but I'll get there soon). I'm hoping that things will start flowing nicely and the stock levels will not be a problem for long.