Let's suppose there's an ecology investigation going on. The most relevant species of insects in a mountain range should be sequenced because they want to make a phylogenetic tree using bioinformatics software. How much would cost the sequencing at a decent quality, for each insect? Is it still too expensive to try something like sequencing the genomes of the 1000 more relevant species of an area?
The cost depends on the expected quality and coverage (see company websites for some ideas of relative cost).
But you don't need to sequence the entire genome to make a phylogeny. A few standard barcoding or taxon-specific regions is enough. Or you could sequence the mtDNA genome.
The hardest part is getting the biological samples! You need LOTS of high-quality DNA to sequence a nuclear genome. I'd worry more about that aspect of the project.
But this honestly sounds more like a "thought experiment" or exam-type question than a real research project. Heck, you can just ask Wikipedia for genome sequencing costs.
If this is a real project, you'll spend more on the salary for your Bioinformatics technician than anything else.
In addition to what is said above, cost of sequencing also depends on what platform is used for the purpose. Well, though experiment would not cost anything, you can sure sequence all 1000 or even more species.
On the Illumina NovaSeq 6000 Platform, you can sequence about 48 human genomes on a single S4 flow-cell. The libary preparation of 48 samples costs about (approximately!) 7500€, the flow-cell 14000€. This is 21200 for 48 genomes or about 450€ per human genome - very approximately. If the genome is less complex, you can pool more than 48 genomes per flow-cell, if the genome is more complex, you can pool less. On smaller systems, sequencing will usually be more expensive, possibly by up to an order of magnitude.
It may be neccesary to additionally do some long-read sequencing as well (e.g. Nanopore sequencing or similar) to gather information about the arrangements of contigs or to fill in gaps (often containing repetitive sequences that are almost impossibleto map with short reads). This will add to the costs.
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