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In addition to the first, cheapest option: Trainer Road and probably some others have a virtual power option based on known resistance curves of various turbos and a speed / cadence sensor (ANT+ or Bluetooth). It won't be accurate as an absolute power reading but in a closed system it's fine. Do an FTP test and Trainer Road works out intensities for all subsiquent sessions. I've found it really very good for the last couple of months.
dbr
Here's the options:
Train using perceived effort with Sufferfest videos or the like. For this you can use any old turbo and still get some decent gains. You'll need to work out your plan, when to do short intervals, when to do sweet spot training etc. Typical outlay £100
E.g CycleOps Mag
Train with a 'power' turbo that measures power. Obviously you won't be able to use power when off the turbo but that may not matter if your training on roads is generally steady and the intervals are saved for the turbo. You will be able to use pre-made plans and sessions from places like Training Peaks and Zwift. Typical outlay £200 - £300.
E.g Elite Qubo Power
Train with a 'smart' turbo. Similar to before except a 'smart' turbo can be changed automatically for use on things like Zwift and will have better integration with a phone app for control or recording. Can be from £200 to £500
E.g. Tacx Flow T224 at the cheaper end. Wahoo Kickr Snap at the pricey end.
Or get a power meter and use any turbo. The benefits are that you can train to power on the road as well and it will probably be more accurate overall. You also don't have to worry about calibrating the turbo each time you use it. If you want to go all out then buy a power meter for your bike and also get a turbo trainer that can be controlled automatically.
Price could be anywhere between £200 and £2000.