I have lifted in three different organizations (USAPL, APA, APF) and they all use the same rules regarding the bar (except that I don't believe the USAPL allows the use of the 55lb bar for squats). I have also ran several meets and own my own equipment. For my equipment I have a Texas power bar (45 lbs), Texas deadlift bar (45 lbs), and a Passanella Squat bar (55 lbs). The only one that is really springy is the deadlift bar but that is how it is designed, so that it gives a little to help with the lift. These are just better bars than are found in most gyms. I have had several 900lb+ squats attempted on my squat bar, numerous 600+ attempts with the power bar, and 1055 on my deadlift bar for a two man deadlift with no damage.
From IPF Rulebook: 4. Weight of the bar and collars is to be 25 kg.
From the WPC (APF) Rulebook: iv) Weight of the bar and collars is to be 25kg.
The APA page is acting up right now but trust me, it is the same. The collars are what make it 55 lbs.
On a side note, by your post I assume you lift USAPL? And I also noticed you are from Ohio, are you coming up to the Arnold to watch the powerlifting?