since we don't really have any cake decorating stores, besides joanns, michaels, hobby lobby,etc. i have never seen it. so i would suggest buying it online, like global sugar arts. but i am curious why you are wanting tylose? if you are wanting a firmer fondant, why not use gumpaste? that is more readily available.
but if you do want tylose
http://www.intotheoven.com/Gumpaste-Ready-Made/Mixes/c73_86/p831/Tylose-(55-grams)/product_info.html
http://www.globalsugarart.com/product.php?id=17057
HTH
You could try Baker's C&C or Orson Gygi. I couldn't find tylose on either website, but they may have it in store. It would be worth a call.
www.gygi.com
www.bakerscandc.com
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