I think you're confusing DNA sequencing with DNA synthesis. DNA synthesis is much more expensive, around $0.07 per base pair [1], and bacteria have more than a million, so it's over $70.000. Then you just have the DNA, turning that into the bacteria is very complex, I'm not even sure whether it can be done.

Using CRISPR to modify existing bacteria is probably cheaper, but still complex.

[1] https://briefglance.com/articles/elegen-slashes-dna-synthesi...