Yamaha DTXpress/DTXplorer/DTXtreme

Hi,

I'm on the market for a Pintech ConcertCast snare and I wonder 
what's the difference between those two items at Musician's Friend:
<A 
href="http://www.musiciansfriend.com/srs7/sid=03092014300106209019503
9125145/g=perc/search/detail/base_id/45228">Pintech Dual Zone 
Concertcast Snare Pad (sold for 129$)</a>
and
<a 
href="http://www.musiciansfriend.com/srs7/sid=03092014300106209019503
9125145/g=perc/search/detail/base_id/45231">Pintech Dual-Zone 
Concertcast Snare Pad (sold for 99$)</a>

Is it the same thing? How come there's a 30$ price difference?
(if the links goes wrong try a search for CONCERTCAST on the 
Musician's Friend website. You'll see 2 concertcast dualzone snare...

Thanks

Yoav