Vincent, you will find the amino acid sequences of this protein in human and mouse highly similar. However, we could identify one or two regions where they differ, so if you are interested in collaborating with us, we can work something out getting you goat antibodies not cross-reactive to the other species. See http://everestbiotech.com/custom-antibody-promotion/
We list a few sources (including non-commercial DSHB) which you may want to check with. They claim human reactivity, and don't mention mouse, so might be worth contacting for more details. Just search here http://www.linscottsdirectory.com/search/antibodies for UBQLN2, selecting "human" from the reactivity filter. Follow "more info" to suppliers' datasheets. Good luck.
I hope you will also share your experience with the antibodies on www.pAbmAbs.com? Here, scientists can share information about the antibodies they use in their research. Your input is therefore very valuable for other scientist when they are looking for reliable antibodies.
As a bonus a can let you know that all reviews received before dec 15th will enter a competition where the winner will receive €500 for personal spending. Every review counts as a lottery ticket-also reviews on antibodies that have already been reviewed by other scientists before you. It is quite simple to review. All you have to do is go to the website, click "submit review" and here it is described how to design the review.