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Silver Primm Swords are pretty common, and typically are listed at 1,000 N-Meseta (at least on Ship 1). However, we notice these will almost always sell and are easy enough to farm. If you have a handful of them and aren't planning to upgrade your own gear soon, putting them on the Personal Shop is better than dropping them off at the npc Vendor. Gold Primm Swords are more rare and will net a bit more. It adds up pretty quick.
The best thing is there is no minimum to cashout - our first one was just 72p wired to our Paypal account. You also have the option to donate it to charity.