I get envelopes from the International Odonata Research Institute.
https://iodonata.updog.co/They are much better than what bioquip sells and have large quantities.
On May 15, 2017, at 10:59 AM, Menard, Katrina L. <[log in to unmask]> wrote:
We’re going to be transitioning our adult specimens of Odonata collection from fluid to envelopes, and we were wondering if anyone has a vendor they approached for getting thousands. We’re estimating to need about 5,000. Bioquip has some envelopes, but I didn’t know of other companies.