Ivermectin (Ivomec, Frontline) is great for lice, mites, worms, ticks, fleas, etc...
I just set all the eggs for a couple days after treating but there are several people here who have said they eat them with no withdrawl period. Ivermectin is the same medicine used to treat worms in humans, so for all the more dose you will get in a couple eggs it's not going to hurt you at all. The generic, Ivermectin, is about 1/3 to 1/4 the namebrand price. Use .5 ml for a full size bird, .25 for juveniles or bantams & just a couple drops for chicks. Split dose & apply near vent, under wings & back of neck on bigger birds & just pick a location for babies.
Permethrin is the active ingredient in Sevin, but as already stated Sevin is not recommended for animal use because it also contains other ingredients. There is Permethrin that is specifically for poultry but I have found it to be more expensive & require a much higher dosage to treat than Ivermectin & there is also a withdrawl period required for eggs since it is not safe for human use.
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I went twice last year when I still lived closer. Wish I had a car!!!