Amazon has a bunch of what seem to be compatible adapters. I can't be sure because I don't know what the power input on the Mini VOX looks like. They sell two for $14 with free shipping fro Prime members:No luck with TiVo as of yet, but did find out that they sell the OEM power adapter for $6.99 on their site, however they want over $9 for shipping (cheapest option) which seems like highway robbery. For as much business as they do with shipping through carriers it looks like they are definitely lining their pockets with the shipping charge. Can't seem to find an OEM charger with free shipping for less that $10. Anyone have a free shipping promo code for TiVo.com?