I haven't dealt with Tower Hobbies much but here are some other heli sites you can look at:

www.heliproz.com (Deal with heli's only)
www.southeastrc.com
www.rcheli.com (This site used to be Ricks R/C which is closed at the time being, but should be reopening under a new name fairly soon, they also deal with only heli's)
www.onlyraptors.com (for Thunder Tiger Raptor helis only)