I know this isn't usually recommended on this site but a couple of the items listed can quite often be found on ebay; specifically the eyepieces and filters. For some reason, out of all the major brands, Celestron seems to consistently have a lot of equipment available on ebay.
BTW, the box set of eyepieces also includes a moon filter; however I've no idea how it would compare to the one you have listed.
Good Luck
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