Too early. The only coupons I know are the ones for Entertainment book holders. I haven't even seen one for my late September trip yet. The rates for National are staying very high this year and have only been dropping just weeks prior to a trip now. I've been watching for my September trip and November trip and so far nothing great out there. I've taken 3 trips this year (Jan, March, May) and the rates dropped slightly right before, but nowhere the low rates of past years. I've had to set a new "acceptable" rate for myself now.