Big trak Jr. looks like an interesting robot base here are some pitures :
Inspired by Barktrak
That looks like a cool hack platform to me. Maybe I should make a mini BarkTrak?
Have you seen BigTrak has been re-released?
Yes but it is not cheap
I have no idea on price over in the US, but you can find them here in the UK, for around £29. I thought that was quite reasonable, I guess the postage to the US could be quite steep.
My misses bought me one for my birthday.
I'm not hacking it though. I love my BigTrak.