Unfortunately, as a consumer there isn't a whole lot that can be done. It's sort of like trying to buy a PC with Linux instead of Windows -- Due to volume, the cheapest and most readily-available hardware is ironically likely to have the Microsoft tax built into the pricetag. Similarly, nearly all PC motherboards will have the cost of proprietary BIOS royalties built-in. So replacing proprietary BIOS with Coreboot does not really help the vendor to realize potential cost savings.
IMHO the best thing is to get involved with the development communities, especially for stuff like servers and HTPC machines, and hopefully inspire some new products that are designed with Coreboot in-mind from the very beginning. The good news is that this has become much easier thanks to AMD who has upstreamed all the low-level code necessary to make that happen for modern hardware such as Fusion :-)