Alas, I have not. I think I'll throw one in my basket to be included when I next place an AG order. Since discovering TRC a few years ago I must admit to possibly having blinders on. I really like their products and customer service.
I hate to go outside the AutoGeek ecosystem here but I'd feel remiss not to mention towels from The Rag Company. The Pluffle has recently become my favorite drying towel.