Tascam US-428 Power

Hey all,
I recently picked up a Tascam US-428 audio interface/mixer thingy. It requires a 7.5V AC/AC wallwart and I can’t seem to find any anywhere for less than $30. It says that it should only use a PS-P428 adapter, but I feel like I should be able to find a 7.5V AC/AC wallwart somewhere. I just need help finding the adapter is all. Thanks :slight_smile: