A typical all season radial, or slightly performance oriented tire in that size will not be expensive.
General, BFG, and probably Uniroyal still offer 215/70-14 and such.
I'd expect Continental, Michelin, and Goodyear to be a little more expensive but you never know.
At least as important is the specific tire model. The more 'performance oriented' street tires almost always cost more. This is true whether its a studless performance snow tire, or ultra performance summer only tire.

When looking, remember the treadwear and traction ratings are based on other tires made by that manufacturer.
IMO general higher tread wear rating is generally not any worth trade off for decreased traction.
Also depending on how much the car will be used and where it sits, may end up replacing the tires before the tread depth is worn out.