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Maybe I am missing something but where can these be enchanted at? The highest enchanters I am see are only up to 750
I think that it depends on which expansion you are in or which ones you have enabled. For instance, DS in the lower level of the Shipfitters Union Hall located in Seversk Harbour in HoL IV can enchant items up to 9000 stotage, but it will cost you (DS charges 25,000 per Enchant).
Also, as your Environment Magic skill increases you should be able to Enchant items to a goodly level. My Environment Magic is currently at 502 and I can Enchant items up to 2409 storage.