Wendy, $85-$90 is the going rate for a new Glory bit. You're not likely to find a new one for any less. Are you on the CD-L? I see used Glory bits advertised on there from time to time. You might be able to pick one up there in the 5.5" size at a reasonable cost.
I used to order from Smuckers' and they still have a website but I'm not sure what their status is. I thought they had gone out of business: http://www.smuckersharness.com/ Anyway, they don't carry Glory bits, or at least they didn't used to.
I unfortunately sold my last 5.5" Glory bit a couple of years ago or you could have mine. The fat-lipped Hafs are in 6" bits now.
The last driving bit I ordered came from Chimacum Tack, I called and spoke to Janie, told her what I wanted. It was in the mid-$40's, including shipping and arrived within 3 days. I'm not sure if she has Glory bits, but you could always ask.
Hmm, you will be hard pressed to find a Glory bit in the ballpark you are looking for. Glory's typically go for $80-$90 regardless of company. If you are concerned that your horse won't like it and you don't want to shell out the cash just in case then contact Coachman's Delight. They have a very liberal bit return policy, unlike most retailers. If your horse hates the new bit, you just return it for another or a refund!
Uh, I feel silly - I just looked at the pic you posted, which I had not done prior to my last post. That's actually a Glory knockoff and it's only available in 5". That's why you are not finding it in a 5.5". It retails new for about $60 and does not come with a curb and is most definitely not made by Glory.
Feeling your pain about bit prices - just bought a Sprenger KK Ultra Liverpool...sigh....horsie likes it tho'.