DSG has the 40 round PMags for $13.99 each (normally ~$20). you must log in to see the (sale) price. free shipping if over $99. what I did was add 7 mags, that's $98, then added a single pack of mag covers $2.28, that breaks the $99 free shipping barrier.
https://dsgarms.com/mag233blk
https://dsgarms.com/mag233blk
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