Garmin foot pod prices??

[Pennyguy23]

I am looking at a foot pod to use with my new forerunner 305. Sinces its about 10degrees here in michigan I have been running on my treadmill. So needless to say I could use one. There seem to be two different models. One I could get for like 45$ and the other is like 95$. Whats the difference? Thanks I figured you all could help me since you helped so much with the watch itself.