Storm windows

I own a 100 year old home with double-hung, single-pane windows that are in very good shape. Unfortuantely, the storm windows are a disaster. I wish to have someone replace the storm windows. I just contacted the Borg to get a quote to give me some idea of the pricing.
Can you give me some guidance on buying new storm windows?
Can you recommend any brands?
Are double-hung, double-pane, storm-windows available?
Are there any installation details I should insist on? (i.e. a bead of caulk under the storms?)
Thanks for your thoughts...
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you can get stand alone storm windows that just screw on to the window trim from outside for about 40-80 each depending on size. yes you need a bead of caulk under them & they should be installed on warm enough day for the caulk to seal properly go to home depot or menards or lowes & speak so someone there. or pay a contractor 35/ hr to do it
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