I bought my 05 LR3 SE V8 with 23,000 miles on it . . . was originally looking for a CPO LR3 but the CPO warranty is limited (time and mileage). They sold me an aftermarket warranty for $2800 through the dealership (Land Rover, Denver East), no deductible provided I take it back to them for any work.
I've had the compressor replaced, the transmission ECU replaced . . . all covered under the warranty and at zero extra cost to me. The only issue I had was that one failed right after the other and the warranty company had to "inspect" the vehicle before approving the claims . . . . .
There are tons of companies out there that offer warranties . . . . . if you can, I'd try to buy it through your local LR dealer.