In other software we have used utilize a Price Group table. A simple table of Name and Price. A product is then assigned a Price Group and when the product is loaded the price is read from the price group table.
Updating the price in the Price Group table then sets the price for the products that are in that price group.
Instead of adjusting the 200 products we adjust just one Price Group price. This would save a lot of exporting and importing. If not a table, then a Price Code field in the product table would help with exporting just the products to update.