I have some advice for anyone looking or a carrier -- go ahead and get what you want. I have wanted a Kwigy Bo as they are so well made and functional with the outside pockets. They are made for a Yorkie in size and proportion. But that price tag kept me away. Now I have half a dozen carriers and have paid way more than I would have if I had just bought the KB to start with! I do have lots of barely used carriers though!
My favorite is an older Longaberger carrier, they no longer make. It was in the beige/black gingham check. It has an extendable handle, wheels, and is plenty big enough for me to tote two of mine at the same time. It is hard-sided so it is sturdy and would be great for airline travel. It has doubled as a crate for my little Annie when we traveled to my son's college football games. Most of the pretty bags I have, do not have the sturdy sides for flight but they are great for shopping and outings. I also have a Petote, a Vera Bradley, a Juicy, a Chromebone, and a couple of no-names.
Petote -- great if you have a larger dog, want to carry two or just like a roomy bag. Champagne color is gorgeous! This is a beautiful bag and comfortable for the pups.
Vera Bradley -- typical VB pretty and fun. Soft-sided, room for one. Comfy.
Juicy -- Black roomy enough for one, but not two, semi-soft sided. Not really my style. But I had a cute Juicy hooded shirt for Ben and thought he should have the bag to match. I never use it though.
Chrombones Hobo -- I love this bag (have a Coldwater Creek purse almost like it)but it is short in height. The pup must be small or lay down when in this bag. They usully do lay down when you carry them tho. It is the best stealth bag as it looks loke a purse and the black mesh ends do not show the pup even tho they can see out. Annie seems to like this bag fine but Ben (now 5 lbs) would not fit comfortably.
I have a $12 TJ Maxx bag that worked great for us in the beginning. It is blue cordory and has semi-soft sides. I would not use it on a plane, but it is a good "take to the vet" bag. Also have a hard-sided carrier/small kennel that I have taken mom and pups to the vet in. It is no fashion statement but protected the family very well.
So there are all sorts of possbilities! If you are really on a budget, might check ebay or Petedge for bargains. Another option is to look at the Yorkie Products for Sale threads here on YT. Most sell bags that are barely used. I bought a couple of mine here on YT and was VERY pleased with the condition! But if you had your heart set on one, I say save up and get what you want or you will wind up like me, still buying bags!