This is my robot B.E.A.T.S. It is a YDM clone.
B.E.A.T.S. stands for, Bot Entertaining Autonomously Through Sound.
It took me about a month (off and on) to build this robot, but I had a lot of fun (and a little frustration).
The following is a list of parts used:
Electronics Carrier - Ant-Style = $13.00
PICAXE-28X Starter Pack = $32.00
SRF05 Ultrasonic Ranger = $30.00
Gear Motor and Tread Package = $40.00
Gear Motor 10 - Geared pager motor = $10.00x4 = $40.00
tinyCylon = $10.00
Sampler board = $11.00
Misc parts (wire, led, speakers...) = $40.00
Total = ~$229
You can view my build blog of this robot here.
Although I consider this robot complete, I am still fine tuning the code to make it better.