If you bought the bow new then it was probably at Dick's Sporting Goods. They should have the modules as all Martin bows that use these modules are shipped with a full package of 7 modules. If this is the case then you should have gotten the modules with your bow as they are part of the purchase.
If you bought the bow used then you can find anybody that sells Martin bow and they might have some on hand. If you need to purchase them then try on Martin's on-line store. The item # is 3056 and they cost $13.33 + shipping. That's for a complete package of 7 modules.
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