What the heck, while I’m on this little roll, here’s one other Necron unit you can make on the cheap. Although, to be fair up front, like the Deathmarks, this one’s more “inexpensive” than flat-out cheap, and
Lots of folks love that Transcendent C’Tan, but it is scary expensive. You’re either paying for the whole Tesseract Vault (about $140) or you’re buying it online as bits (around $60 most places I’ve seen it). Neither of these is a great option if you’re short on cash.
All along, the Necron fluff has talked about how several of the C’Tan disguise themselves as other creatures. Even with the slight retcon that the ones we meet are all “shards” of the total entity, it’s not hard to believe they could take on any form. So any oversized model could work as a C’Tan with the right paintjob.
The Dark Elf Cauldron of Blood has a great statue of Khaine. You can pick it up for under twenty bucks on line, even less if you get lucky with an eBay auction. It makes a wonderful Avatar if you’re an Eldar player, or just scenery. But it could also be used for other purposes...
Here’s the complete statue. I could cut off the topknot, some of the horns/ vanes on the head. I could also shave off some of the spur-type horns growing along the arms and legs. This would leave me with a pretty basic humanoid form with an elongated head.
I could also grab the control panel icon from the Necron Catacomb command barge. You may already have one of these in your bits if you built an annihilation barge. It fits very well right on the chest with no work at all. With a tiny bit of filing and shaving, it would be a perfect fit.
If you can afford to pay a little more, dig around online or in your bits bins for detail pieces from the Wood Elves line. There are tufts of weeds, blades of grass, and all sorts of small branches and such. But if they’re painted electric blue or neon green, these would look a lot like the little energy wisps that are radiating off GW's Transcendent C’Tan model. This would also work with really simple green stuff tentacles.
And just like that... you've got a Transcendent Star Dragon, for under twenty dollars.