I've been checking rental costs on some companies.

Hertz: $1328
Budget: $615

Trouble is neither will reserve a Grand Marquis by make and model. I might get "or similar" which is okay as long as it's a Crown Vic or a Town Car. It seems Budget only has Grand Marquis in the particular price class I'm looking at, so it looks good for them.

I'm still not sure if I want to add an extra $600+ to what's already going to be an expensive trip.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.