I might get one pack of Blend to give the other SX-70 a run, but at $2/shot (plus shipping), I don't see much reason to use it. Will look nice on the shelf though.
I sold the 110a (a Four Designs mod) hoping I'd run into a 110b converted to packfilm or 4x5 cheap, but it hasn't happened yet.
Dont waste your money on the blend crap.
Stick with normal 600/779 and either modify the SX-70 electronics (replace 1 single capacitor) or use an ND filter (google for the mods, there are lots)
Ive got 2 converted 110As to packfilm, (see my avatar) both are custom and unique, I couldnt just convert, I had to change them.
Ive got a 110B, that I am going to convert eventually. Truthfully, the cost/labor or a 110A/B conversions is worth $400+ at least. Less than that, id argue the seller got gyped (if they did the work themselves). What is cheap to you?
I know of a certain 4x5 110B conversion you can get for, oh, about $4000.