I would check with Elmore's or Plainfield Shooting Supply if your in the INDY-land area or ACME in Seymour if your down south.
We don't stock them, but our distributors have them available for order. Would run $569.95, and EOTech/L3 has a $60.00 mail-in rebate on them through the end of August.
Or if you're not wedded to the EOTech G33, we should have a Vortex 3x mag in next week.