It is cheaper and easier to troubleshoot when you DIY. If you're not capable of building and configuring yourself, my advice is do not buy. Here's why:
Often Apple releases updates that address security or kernel optimizations. These updates can break your Hakintosh, making it unbootable. I have experienced this using Gigabyte logic boards (preferred) and it was the least headache compared to other brands. OS upgrades are especially risky because you may have problems like wifi, bluetooth, or sleep not working. To resolve, you will have to find the proper kexts (drivers) that are compatible with your board. Sometimes you won't find the kext for weeks, months, who knows.