If you are handy, I would try cleaning up the contacts and rebending teh contact springs (that worked for me on 965). If that doesn't work, Volvo does not sell the parts separately so a new wheel is the only new part choice. However, all you need is the wheel from a recent wreck, minus the expensive air bag ( just have your own moved over). Without the bag, I'd be suprised if you had to pay as much as $100 for an excellent used wheel, and you might find a fancy one you like better from one of teh upscale interiors like recent C70's (just be sure the air bag fits opening). If you can get to a pick and pull yard with the right Volvo, you might even be able to pull the horn contacts from back of wheel - they do come off, just not sold separately.
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Mike Sullivan ('91 745 (184k), '95 855T (70k), '98 V70XC (83k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '93 965 (147k) .