Amazon has the 1-Quart Bosch ESI6-32N Brake Fluid (Direct Replacement for DOT 3, DOT 4, and DOT 5.1) for $8.17 with free shipping on $25+ or with Prime. Lasts 100% longer than DOT 3, 50% longer than DOT 4, and 10% longer than DOT 5. 1.