Actual work is not a big deal,
But if there are other issues preventing such that could be a big problem,
Is the land buildable? Not in a flood plain, water adequate for drinking? Drilling a hole and testing the water is only way to know if water below is good, if you have neighbors using same water ssource(they can be a mile away) you have good chances of good water, just may have to drill deeper, such tests can be part of the purchase agree,
With such a big drop in price probably worth spending a few bucks for proper tests,
Also what do you consider small piece of land?
$200k is quite a price for rural land,
I paid $20k for 50 acres about 10 yrs ago. Completely buildable, have a house on it now.
I didn't go through the tests when I bought the land as it was hunting land first, but did go through the tests when selecting building site.
Leach field can always be built up, added to.
Water quality would be my main concern.