Another lapping film source
Just found similar alum oxide lapping sheets here, even cheaper and slightly larger:
Lapping sheets and plate
Comes in a pack of 10 for $13.10, so it's $1.30 per sheet.
Each sheet is 9" x 13", you can then cut each sheet into four individual 3 1/4 x 9" sheets for honing. $1.31/4 = 33 cents a honing sheet!
I'm planning to get the 9.5" x 13.5" glass plate they have as well. I can then mount three of the 3 1/4" x 9" honing sheets along three of the side of the glass plate and thus have all three grit sizes (5um, 3um, 1um) available on one plate!
I'm currently using diamond lapping sheets, and they are awesome and long lasting (been using the same sheets for close to three months, they are starting to wear out now), but they are about $5 for a 3" x 6" sheet.
How long do the alum oxide sheets last, WildTim?