Crittertrails are indeed too small.
a 24x15 inch cage is 360 square inches, which is exactly the minimum recommended size in the US. If you can, i suggest going even bigger.
The closest cage you can buy from petsmart is this one;
Grreat Choice® Small Animal Pet Home
It's a little smaller that 360 square inches, but I used it for a couple months with my syrian. It's bigger than a Crittertrail anyway, which is good.
The US has terrible small pet care standards. It's almost impossible to find a store-bought cage that is suitable as a long term habitat. You can buy a cage marketed toward a guinea pig or a rabbit, which are good and big enough for hamsters, but you will need to cover the bars in wire mesh to prevent escapes.
Because of this, most of us in the US choose to use alternative cages. Here's a few of the options:
The simplest is to simply use a glass aquarium or terrarium. Both of my hamsters (a syrian and a robo) are housed in 40 gallon breeder tanks, and the syrian's has a mesh locking lid to keep her from escaping. This can be a little pricey, but if you find them on sale or secondhand they can be much cheaper than traditional cages. They're also easy to clean (I use a shop vac and damp cloth to clean mine
) and since there's no bars, the hamster cannot develop a dangerous bar-chewing habit (my syrian quickly developed a terrible bar-chewing compulsion during the few months she lived in a barred cage).
The following options require some DIY ability, but you can make a great hamster cage out of other furniture, such as bookcases or tables. The most popular options are mods based on IKEA furniture, but you can use whatever you have access too. There's lots of tutorials both here on the forum and on YouTube, on how to make some of these cages.
Lastly, and also requiring some DIY, is a bin cage. With this option, you simply buy the biggest plastic storage bin you can find, and modify it to house a hamster. Usually this includes cutting out windows in the sides or top, and fitting it with wire mesh. Again, there's tons of tutorials you can find online. This is the cheapest option, many times you can have a bin cage done for $20 or less.
I do hope this helps, us US owners gotta stick together, it's tough to raise a hamster over here