Hyper lube can be mailordered (unfortuneately in largish volumes) here
Hyperlube
They only seem to sell it in 4 bottle packs for $32.00 (presumably plus shipping) They don't say what size the bottles are, I would guess 16 or 32oz. since thats the standard size for most 'magic engine potions'
I might be interested in sharing a package w/ someone, as I doubt that any WC folks could ever use up four bottles of the stuff...
Dexcool you should be able to get at any autoparts store, or possibly a GM / Toyota dealer.
The sanitizer can be had at your local pool store (hopefully) or Google for 'In-the-Swim' which is one of the bigger mail-order pool supply places.
Gooserider