Collabo.com Wow!! Nice one. Very common term used in the music industry and music channels/radios, etc. I basically hear that word almost every day by some radio host. Very brandable! End-users would mostly be music record companies.
Reseller price: high $x,xxx
End-user price: $xx,xxx or more- really depends how you negotiate.
Very strong name you have there!!
Also, "collabo" is taken in all the major, as well not so major extensions. Your .COM is 16 years old!! Which just makes it even sweeter.