Check
No perc test. Spend the few hundred dollars before you spend the rest.
This single test is the difference between a $10,000 septic and a $35,000 one, and occasionally the difference between building and not building. Write the offer contingent on a passing soil evaluation, at the spot you actually want the house rather than wherever is easiest to get the auger to. It is the cheapest option you will ever buy.
Read next: Buy the cheap defect, never the expensive one, Keep two contingencies, and never waive these two