$20.00 at target. I live on the east coast so i can't vouch for the any other targets but you can always get them off line if you can't find them in stores.
You can put the end in a pot of boiling water for a couple of seconds and then try to pry it off. I will take a number of dunkings in order for the water to melt the glue and it to come off. You just have to be careful not too leave it in the water too long or it will worp the barrel.
You can find this gun at pretty much any store that sells star wars toys. There was a pricing error at my Target were i got these so i got them for 4.98 they are normally 20.00.
The average range I got for the Clonetrooper blaster after taking out the air restrictors it was only 21'. The average range I got from the Rebel trooper blaster was 26' after removing the air restrictors. Hope this helps.