If you don't ever plan on getting the AC system working again, you could just leave them open. Otherwise, any shop that works on hydraulics should have little plastic caps to plug the hoses with. They come in bulk and aren't expensive. If you ask nicely, they'll probably give you a couple for free.

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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.