OK all, a couple orders of business. First, thanks again for the interest! Second, I'm afraid I wasn't able to find a wireless mouse to test with. I'll be busy with "real" work this week, so there might be a bit of a delay, but I'll find one 
. Third, I've made 2 changes to the design- I got rid of the button, and there will be an option of using a standard PS2 connector instead of USB. The latter is so the device can easily work with PS2 KVMs (I've got one such KVM here; I'll test it out later this week). Now as far as pricing, it's looking around the $15 mark for the kit (plus shipping), and a bit more for the assembled version. I'll also offer the bare PCB and/or the programmed chip separately. Now since this will likely be a small production run, there will be a several week turn time once I take orders. I could shorten that by using a quick-turn PCB manufacturer, but then we'd be talking $50 for the kit at these quantities, not worth it 
Stay tuned...
. Third, I've made 2 changes to the design- I got rid of the button, and there will be an option of using a standard PS2 connector instead of USB. The latter is so the device can easily work with PS2 KVMs (I've got one such KVM here; I'll test it out later this week). Now as far as pricing, it's looking around the $15 mark for the kit (plus shipping), and a bit more for the assembled version. I'll also offer the bare PCB and/or the programmed chip separately. Now since this will likely be a small production run, there will be a several week turn time once I take orders. I could shorten that by using a quick-turn PCB manufacturer, but then we'd be talking $50 for the kit at these quantities, not worth it Stay tuned...