Transdermal is definitely a scam. If you have light skin and dark hair, you may have some benefit from laser, but it is unlikely you will have the result you expect (permanent hair removal). Many consumers see a permanent hair reduction of one-third to two-thirds, but not complete removal that’s permanent.
Using a laser at home is dangerous and illegal in some places. If you want to buy a professional laser to use at home, which I do not recommend, they are available on auction sites like eBay starting at US$5000. Anything lower than that is a scam that won’t work.
Again, this is dangerous and not recommended. Spenmd your money getting professional treatments from an experienced practitioner with approved equipment.