Trainers are less expensive and you can use your current bike. If you have a specific position all you need to do is clamp the rear skewers into the trainer.
Spinning bikes are pretty expensive. They are very heavy and not easy to move around. You can't easily hang a spinning bike in the garage. The flywheel is over 40lbs plus the bike itself. The adjustments: it's not possible to fine tune the position like a bicycle, you can get really close depending on the model, they usually have increments.
If you are really into spinning and have a home gym, money is no issue, get two so you can have a mini class. Check with a local gym the often sell them used at a good price after they are depreciated. They will need some work.
Again, go the local Y or gym and try a spinning class to see if you like it. If hubby doesn't want a trainer, get him a membership to the gym for a few months.
You can get a cheap spinning bike with shipping for a little under $500. A more durable and serviceable one will cost $900 to $1600. You can get a gym membership for under $20 per month and the bikes will be maintained plus you will have an instructor to guide you, shower, hot tub, weights, other equipment, other classes, maybe a few personal training sessions.
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