I recently priced a variety of sheets in anticipation of a big purchase and here is how the prices broke down:
Vario:
(Dealer)(Quantity)(Price+Shipping)(Price Per)
(Mit,
ebay) (50) ($34) ($0.68)
(Mit,
ebay) (200) ($101) ($0.51)**** Cheapest
(Amos Advantage) (5) ($4.00+s/h) ($0.80+s/h)
Hanger (2 Sided)
(Amos Advantage) (5) ($9+s/h) ($1.80+s/h)
Mit is the most competitively priced dealer of Vario sheets that I've found on
ebay and I've been very happy with my orders so far.
Of course the biggest problem I have with Hanger sheets is the price. For $1.80 a sheet you can buy the very nicest 64 page Lighthouse stockbook (LS4Z, not the cheap looking Lighthouse they sell on Amos Advantage) with all clear acetate interleaves, nice padded cover + slipcase, and of course double-linen hinged pages (which in my opinion is far nicer to use than any ring'ed binder) so its a little bit of a stretch paying that amount of money for the sheets alone. Of course if you're persistent you can sometimes find a good deal on
ebay - I recently picked up 30 Bosham Hanger sheets and 10 Prinz Hanger sheets for around $0.70 a sheet including shipping - YMMV.
Personally I find Hanger sheets to be more visually attractive and use them whenever I can. Another possibility to look into would be the Vario-Plus sheets @ around $1.26/sheet.