I have found it at most major grocery stores or google it and there are many online sites to buy it...Great product for curing. Made pastrami and it was the best I have ever had. Have fun!!!!
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Where To Buy Morton's Tender Quick by: SmokerBill
You can purchase Morton's Tender Quick at the online store at the Morton Salt website. Here's a link to the page...
I don't know of any curing mixes that are an exact substitution for Tender Quick. It contains salt, sugar, and the curing salts (sodium nitrate and sodium nitrite). There's just a small percentage of the curing salts in the Tender Quick mixture.
You could do a search for "Prague powder", which is a type of cure. However, I'm not sure of it's concentration, and how much you would have to use if it were suitable to use instead of Tender Quick.