maleea - yes, I have kept a veiled, Luna just died in July 
The other poster, DgG7, said they are handleable and that you can use similar setup - wrong on all counts. PHLdyPayne is closer on the mark. An adult needs a minimum of a 4'x4'x2' screen cage. Lots of foliage for hiding, branches for climbing, etc.
They are relatively high maintenance herps - VERY different from beardies and can be aggressive. Not that they will attack you (though it is possible), but once past sexual maturity their personalities can change. They are easily stressed and do not show symptoms of illness until it is far along so you need to be astute. Not all herp vets are familiar with chams so it is always a good idea to find one first.
The humidity can be a big problem, esp if you live in a cold and/or dry region (northern states). The do need good air circulation but they also need a humid environment so this can be hard to maintain. The veiled is the only chameleon that will eat fruits and veggies, but some accept them more than others and usually not until they are adult.
OK, all that said...the KS chameleon forum is VERY active, fun and friendly (aren't they all??
) so feel free to join in or just lurk for a bit. As for one stop shopping, well, one stop research, you can go to the link in my signature to find the most often recommended and reliable sites, vet info ( by country, state, country) and a list of setup questions.
Chams are wonderful, weird, fascinating animals, but know what you are getting into before making the commitment.
lele

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Chameleon Help & Resource Info
0.1 Veiled Chameleon - Luna. She's now hanging from her big jungle gym in the sky
1.0 Beardie - Darwin
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skipper
0.1 Mad. Hissers and she is on the loose!
0.1 Chilean Rose Hair Tarantula - Rosa Leigh
0.1 Goliath Bird-Eater Tarantula - Natasha
?.? Pinktoe Tarantula - no name yet