Celltei carriers are really cool. So many awesome features and I LOVE mine.
However, they are really expensive (but if you are willing to pay, you can even get them custom made, which is cool!) I am totally cheap, so I didn't want to spend so much.
I got mine off eBay and it was around $35 shipped! I know the same bag retailed for around $140. The one I got honestly looks like brand new and like it had hardly been used, if at all. A lot of time there will be people selling their Celltei bags on there saying, "I bought this bag before my dog stopped growing and now they are too big to fit! I only used it a couple of times!"
Also, the company has a section on their website where people can post classifieds of their bags if they want to re-sell.
Check out
this bag they have in clearance for $57 right now...really good price, I think. It's a size small...check their site for dimensions and see if it will fit your dog. I have the same style (pack-o-pet), but different color/material. My dog seems fairly comfortable in it...he flew to and from Canada in it and behaved himself fairly well....but I did make him "practice" a lot first!