How expensive is a set of electric drums?

Where the freak do i attach the loam...
Answers:    Expect to pay anywhere from ~$100 USD to several thousand. It depends on the model, brand, and quality.

Guitar Center is a great online supplier of musical instruments, and in that are storefront locations across the US where you can preview various models.

You might also hold better luck finding answers in the "Entertainment & Music" category : )