I use a Brinsea Octagon20 incubator,the one shown in Gavin's link.
I usually move the cells into the incubator about 3 days before emergence date.
octagon-incubator-small-pic.jpg
I got mine for £120 including carriage on Amazon.
It is pretty much a no brainer to use an incubator as you can free up your cell finisher colonies for fresh cells by moving out cells to the incubator.
I know somone with two off them. He sets one at 34.5 for incubating cells and the other at 32c for holding the emerged virgin queens in rollers.
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