Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD
Check the dryer information to be sure there is not some change required for 60 Hz. The motor speed at 60 Hz is 20% higher resulting at least 20% more power unless the speed is mechanically reset to the 50 Hz speed.

At 7500 watts, I assume this is an electrically heated dryer with a much smaller power requirement for the motor. If that is the case, you could use a much smaller converter if you could power it separately. Also, $1000 USD seems high for a dryer, but you may be living in an expensive place.