The 510 is a goodun ,the extra carts are nice to have .I take them out of circulation when they start to taste funky or the poly gets a melted crust on top or when I switch flavors.When I get a few in my baggie I throw away the poly ,clean them and restuff them with Fluval fishtank filter.There are a lot of suppliers for 510's ,the ones who place bigger orders get better prices which they can choose to pass along to us.Vapor Kings has some good prices ,ElectroNicStix has a good deal on a 5 pack of atty's.
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Mike Quinn 
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