Do a Google search for "Natural Chemistry Liquid Stabilizer". Leslie's usually has it in stock. It's available through Amazon for a "reasonable" cost. It's much more expensive compared to dry stabilizer.
Did you use the sock method for adding CYA? Stabilizer should not be dumped in the pool or skimmer. Here's how to do it if you want to give it another try:
Solid/granular cyanuric acid (CYA) should be placed in a sock and the sock put in the skimmer basket or suspended in front of a pool return. After adding CYA you should leave the pump running for 24 hours and not backwash/clean the filter for a week. Squeezing the sock periodically will help it to dissolve faster. Test and dose chemicals in your pool assuming the amount of CYA added is in the pool according to Poolmath. CYA can be tested the day after it is fully dissolved from the sock.