Not surprising, I've seen infected clones go for exorbitant amounts, simply because of the name/hype associated with that cut.
If he goes the NPS route, make sure he shuts off his ventilation, needs to be able to rise to toxic (to the mites) levels. Keep animals and people away from the treated area while treatment is in process.
Depending on how bad they are, might wanna use multiple solutions. Azamax is a pretty good, what I call a "less toxic" type pesticide. If you want to declare all out war though, get some Forbid, Floramite, and Avid (they sell bundled packages on Ebay), although you'll probably only need one of them, but it's a very good thing to have them all, in case anything survives or comes back. I use the IPM principles (Integrated Pest Management), meaning I *NEVER* use the same pesticide twice (to prevent the critters from becoming resistant to any one product). I also will go from a "nuke" product, such as Forbid, Floramite, or Avid, to a "softer" pesticide, such as Azamax (azidirachtin extracted from neem) and Captain Jacks Deadbug Spray (spinosad, a soil bacterium discovered in a rum distillery's floor). Works for me, however YMMV.
Last time I had mites, I use Forbid first(@ full strength), then Azamax about 2 weeks later. I defoliated all heavily damaged leaves (this was in veg), and cleaned the room REALLY good with Physan20. I haven't seen not ONE mite since!
One more thing, if your friend decides to go thermonuclear, make sure he wears appropriate PPE. I used a Tyvek suit (10 bucks @ Home DePot), a cartridge respirator (also @ DePot), thick rubber gloves, and goggles. ONLY spray these in veg, and give them a few weeks before flipping to flower, partially to make sure all the pesticides work their way out, and partially to make sure the mites are completely dead. They're EASY to kill in veg, not so much in flowering...
Anywho, hope that helps.
Take care brother!
If he goes the NPS route, make sure he shuts off his ventilation, needs to be able to rise to toxic (to the mites) levels. Keep animals and people away from the treated area while treatment is in process.
Depending on how bad they are, might wanna use multiple solutions. Azamax is a pretty good, what I call a "less toxic" type pesticide. If you want to declare all out war though, get some Forbid, Floramite, and Avid (they sell bundled packages on Ebay), although you'll probably only need one of them, but it's a very good thing to have them all, in case anything survives or comes back. I use the IPM principles (Integrated Pest Management), meaning I *NEVER* use the same pesticide twice (to prevent the critters from becoming resistant to any one product). I also will go from a "nuke" product, such as Forbid, Floramite, or Avid, to a "softer" pesticide, such as Azamax (azidirachtin extracted from neem) and Captain Jacks Deadbug Spray (spinosad, a soil bacterium discovered in a rum distillery's floor). Works for me, however YMMV.
Last time I had mites, I use Forbid first(@ full strength), then Azamax about 2 weeks later. I defoliated all heavily damaged leaves (this was in veg), and cleaned the room REALLY good with Physan20. I haven't seen not ONE mite since!
One more thing, if your friend decides to go thermonuclear, make sure he wears appropriate PPE. I used a Tyvek suit (10 bucks @ Home DePot), a cartridge respirator (also @ DePot), thick rubber gloves, and goggles. ONLY spray these in veg, and give them a few weeks before flipping to flower, partially to make sure all the pesticides work their way out, and partially to make sure the mites are completely dead. They're EASY to kill in veg, not so much in flowering...
Anywho, hope that helps.
Take care brother!