I'm looking to get one for myself but would like to know what the options are.
I see there is a Grace Design Spacebar SB-30 http://www.bhphotovideo.com/c/product/607593-REG/Grace_Design_SB_30_SB_30_Spacebar_Stereo_Microphone.html
Is there anything out there similar but less expensive?
The Grace is definitely the best and I have not seen anything by anyone else that gets anywhere near what the Grace does - that's why I bought both the SpaceBar 30 and the SpaceBar 66.
It is the only one I have seen with accurate angles marked properly - it comes supplied complete with the "riser" to put one mic. over the other, distances are wekk marked and it's also tiltable. I can set up an ORTF pair in less than 30-seconds (1st time is longer - but the second time, after you have noted the bar measurement that gives the correct capsule spacing, it's easy).
I have seen some others that give distance spacing, some give some sort of angle, but none anywhere near as good as the Grace - and I think that the Grace is the only one that tilts.
Price wise - others of the same engineering quality are of a similar price.
In fact, the Grace SpaceBar got designed because Michael Grace could find nothing on the market that would do the job when he was recording - so he designed it himself. The SpaceBar has actually sold better than Grace expected because nothing else does the job so well.
Not cheap, I'm afraid, but well worth it.
You can purchase direct from Grace
HERE.