I am looking to buy this piece, but on fluteworld.com there are two different ones for sale: one for $14 and one for $8. Is there a difference in the music? Because I want the most unedited version they have. Also, just out of curiosity, does this piece contain any parts that require double-tounging? Thanks for your time!

There are many arrangements on http://www.sheetmusicplus.com if you search for Composer: Doppler, but at least 2 show screen prints of the music there:

http://www.sheetmusicplus.com/store/smp_detail.html?cart=33462584312121955&item=3153700
http://www.sheetmusicplus.com/store/smp_detail.html?cart=33462584312121955&item=3349024

I`m thinking the ones on fluteworld are just two different publishers, but you really should call to see if they can tell you the difference/publisher as there are many types of arrangements of the piece. If they can`t tell you anything then you need to buy the music from someone who can... as you can`t return music.

it does require double tonguing, I have had several versions, most seem the same