Here's some costs with my Wheelie crawler so far

spur gear $6
pinion $4
motor $19
wheels $12
tubing $9
ends $16 (way too much)
balls $12 (too much)
rod $3
shafts $22 (had used ones)
lockers $20 (get for $10 now)
servo $29
servo mount $13
steering shaft $1
springs ??
Tires $25