This info is current as of today. Hopefully it can help out transformer experimenters!
Tempel
For EI-162 29 gauge M6, min order 44 lbs (660 pairs), $0.19 per pair.
BONUS: Has will call office in Southern California you can pick them up at to save on shipping if you live nearby.
Thomas and Skinner
For EI-162 29 gauge M6, min order 95 lbs (1475 pairs), $0.20 per pair. Shipping roughly $180 via UPS.
www.cwsbytemark.comHas laminations in stock you can order on their website apparently. Seems VERY expensive.
https://www.cwsbytemark.com/www.edcorusa.comLooks like they have EI laminations from EI18 to EI150 on their website. I called and asked if they actually have them and will ship, they said yes.
Pricing is great, almost like buying from Tempel. Even with shipping EI-150 is only $0.28 a pair for 857 pairs. Minimum looks like 12" of whatever lam you want.
www.laminationspecialties.comStill waiting on a quote from these guys. Lots of people recommended them. Will update when I get it.
Others:
tcmetal: Says "They don't produce stamped products."
polaris laser laminations: Only does stuff by drawing and cuts it out with laser. Very expensive. $5.48 a pair at 125 pairs for an EE roughly EI-162 sized.